Evaluation of Particulate Matter Pollution in Micro-Environments of Office Buildings—A Case Study of Delhi, India

*Saurabh Mendiratta, Sunil Gulia, Prachi Goyal and Sanjeev Kumar Goyal*

## **Abstract**

High level of particulate matter in an office building is one of the prime concerns for occupant's health and their work performance. The present study focuses on the evaluation of the distribution pattern of airborne particles in three office buildings in Delhi City. The study includes the Assessment of PM10, PM2.5 and PM1 in the different indoor environments, their particle size distribution, I/O ratio, a correlation between pollutants their sources and management practices. The features of buildings I, II, and III are old infrastructure, new modern infrastructure, and an old building with good maintenance. The results indicate that the average concentrations of PM10, PM2.5, and PM1 are found in the range of 55–150 μg m�<sup>3</sup> , 41–104 μg m�<sup>3</sup> and 37– 95 μg m�<sup>3</sup> , respectively in Building I, 33–136 μg m�<sup>3</sup> , 30–84 μg m�<sup>3</sup> and 28–73 μg m�<sup>3</sup> , respectively in Building II and 216–330 μg m�<sup>3</sup> , 188–268 μg m�<sup>3</sup> and 171–237 μg m�<sup>3</sup> , respectively in Building III. The maximum proportion of the total mass contributed by PM0.25–1.0 i.e., up to 75%, 86%, and 76% in the meeting room of Building I, II and III, respectively. The proportion of ultrafine particles was found higher in the office area where the movement was minimum and vice versa. The higher I/O indicates the contribution of the presence of indoor sources for ultra-fine and finer particles. Further, possible strategies for indoor air pollution control are also discussed.

**Keywords:** ultrafine particulate matter, size segregated particles, distribution pattern, indoor sources, indoor/outdoor ratio, office buildings

## **1. Introduction**

Indoor Air Quality (IAQ) refers to the level of air pollutants and thermal (temperature and relative humidity) conditions that affects the health, comfort, and performance of the occupants inside a building. The high concentration of air pollutants indoor is a major concern in Delhi city, which has been many times reported as one of the polluted cities of the world [1]. The major sources in an office building are infiltration of ambient air pollutants; emissions from office equipment like printers, xerox. Etc.; emission of VOCs from building materials, re-suspension of floor dust; emission from cleaning chemicals among them [2]. In addition to the sources, poor ventilation builds the pollutant level indoors [3]. The increasing level of pollutants

needs to be managed as it can affect occupant's health, comfort, and work output. Researchers in the past showed evidence that the air within residential and other commercial buildings including offices can be more polluted than the outdoor air even in the largest and most industrialized cities [4–7]. It is also reported that the health risks may be greater due to exposure of air pollutants indoor than outdoor as people spend more time in indoor environment, be it office or at home.

**Author/ City Type of**

Taneja et al. [20]/ Agra, India

Kulshreshtha & Khare [21]/ Delhi, India

Goyal and Khare [22]/ Delhi, India

Chithra & Nagendra [23]/ Chennai, India

Datta et al. [24]/ Delhi, India

Gupta et al. [25]/ Delhi, India

**Table 1.**

**255**

Office & School

*Indoor air quality in different types of buildings.*

Office PM2.5:

**Building**

*DOI: http://dx.doi.org/10.5772/intechopen.95445*

Residential Rural & Urban

Residential Homes

School PM2.5: 30–

160 μg/m3 (Non Winter); 110–789 μg/m<sup>3</sup> (Winter) PM10: 19.5– 110.6 μg/m<sup>3</sup> (Non Winter) and 77.3–713.1 μg/m3 (Winter)

School PM2.5: 61 29 μg/

m<sup>3</sup> (Winter) and <sup>32</sup> <sup>16</sup> <sup>μ</sup>g/m3 (Summer) PM10: <sup>149</sup> <sup>69</sup> <sup>μ</sup>g/m3 (Winter) and <sup>95</sup> <sup>61</sup> <sup>μ</sup>g/m3 (Summer)

PM2.5: 43.8 μg/m3 (Office) -22.8 μg/ m<sup>3</sup> (School) (Summer)

116.5 <sup>67</sup> <sup>μ</sup>g/m<sup>3</sup> (Winter)

**Pollutant Concentration**

68.5 21.8 <sup>μ</sup>g/m3 (Winter) and 43.8 17.9 <sup>μ</sup>g/m<sup>3</sup> (Summer)

*Evaluation of Particulate Matter Pollution in Micro-Environments of Office…*

PM10: 245 μg/m<sup>3</sup> (rural) and 339 μg/m<sup>3</sup> (urban)

PM10: 373–894 μg/ m<sup>3</sup> (Winter) and 107–199 μg/m<sup>3</sup> (Summer); PM2.5: 197–713 μg/ m<sup>3</sup> (winter) and 34–60 μg/m3 (Summer) PM1:169–623 μg/ m<sup>3</sup> (winter) and 23–36 μg/m<sup>3</sup> (Summer)

**Study Period/ Sampling duration**

Oct. 04 – Dec. 05/24 hr

Winter and Summer season of 2008, Hourly average

(Aug., 06, Sep. 06, Apr., 07); (Nov., 06, Dec., 06, Jan.- Feb., 07)/ 6 hr

Winter (Jan.- Mar.

Summer (Apr.- May 11)/24 hr

June–July 2015/ 8 hr., day time

11)

**Key Findings of the Study**

The concentrations of PM2.5 and PM10 were higher inside during the winter. Coarse particles were generated by indoor sources i.e. cooking,

The PM concentrations were significantly higher during the winter period. Emission from the kitchen is the dominant source of Indoor particles in small houses with poor

The results of this study indicated that the concentration of pollutants particularly PM is influenced by the occupant's activity.

A strong seasonal variability with poor IAQ was observed during winter. Human activity seems to be an important factor influencing the coarse particle

The study indicates that the occupant density in the airconditioned non-residential buildings plays a vital role in controlling indoor air pollution levels inside the building.

PM2.5 in the building could be due to its maximum proximity to urban busy roads and poorly maintained HVAC ducting system, which may lead to infiltration and more leakages of PM2.5 from outdoors.

level.

Jan.- Feb., 18 A higher concentration of

burning, etc.

ventilation.

There are no specific criteria pollutants and standards defined to categorize classes of indoor air quality i.e. satisfactory or hazardous. Generally, researchers focus on the CO2 level and thermal comfort parameters for Indoor air quality, which are indicators of sick building syndrome [8, 9]. There is limited information available on the high exposure of indoor particulate matter in buildings, especially working offices, where people spend almost 8–9 hours daily and are exposed. Limited research is carried out on size segregated PM in indoor air in cities of developing countries where outside PM levels are higher [10–12]. Researchers also observed that fine and ultrafine particles are more harmful than coarse particles irrespective of indoor or ambient environments [13].

In the past, Wargocki et al. [14] have experimented in a typical office environment in which two exposure conditions were produced i.e., with and without emission source where the same office staff worked for 5 h in each condition. The productivity of the staff was found 6.5% less in poor air quality and experienced significantly increased incidences of headache i.e., a symptom of sick building syndrome [15]. Fisk [16] concluded relatively strong evidence of relationships among characteristics of buildings and indoor environments, which influence the occurrence of communicable respiratory illness, allergy and asthma symptoms, sick building symptoms, and worker performances. It is also reported that any improvement in IAQ by a factor of 2–7 can increase occupant's productivity in offices.

In the recent past, some studies are carried out to assess the Indoor PM10 and PM2.5 levels in school buildings and residential buildings in different Indian cities (**Table 1**). The major objectives of these studies were to assess PM exposure on children, who are more sensitive [22, 23, 26]. Kulshreshtha and Khare [21] have found average PM10 concentrations in the range of 373–894 μg m<sup>3</sup> in winter and 107–199 μg m<sup>3</sup> during summer in a residential building in Delhi. The PM2.5



*Evaluation of Particulate Matter Pollution in Micro-Environments of Office… DOI: http://dx.doi.org/10.5772/intechopen.95445*

#### **Table 1.**

*Indoor air quality in different types of buildings.*

needs to be managed as it can affect occupant's health, comfort, and work output. Researchers in the past showed evidence that the air within residential and other commercial buildings including offices can be more polluted than the outdoor air even in the largest and most industrialized cities [4–7]. It is also reported that the health risks may be greater due to exposure of air pollutants indoor than outdoor as

There are no specific criteria pollutants and standards defined to categorize classes of indoor air quality i.e. satisfactory or hazardous. Generally, researchers focus on the CO2 level and thermal comfort parameters for Indoor air quality, which are indicators of sick building syndrome [8, 9]. There is limited information available on the high exposure of indoor particulate matter in buildings, especially working offices, where people spend almost 8–9 hours daily and are exposed. Limited research is carried out on size segregated PM in indoor air in cities of developing countries where outside PM levels are higher [10–12]. Researchers also observed that fine and ultrafine particles are more harmful than coarse particles

In the past, Wargocki et al. [14] have experimented in a typical office environment in which two exposure conditions were produced i.e., with and without emission source where the same office staff worked for 5 h in each condition. The productivity of the staff was found 6.5% less in poor air quality and experienced significantly increased incidences of headache i.e., a symptom of sick building syndrome [15]. Fisk [16] concluded relatively strong evidence of relationships among characteristics of buildings and indoor environments, which influence the occurrence of communicable respiratory illness, allergy and asthma symptoms, sick building symptoms, and worker performances. It is also reported that any improvement in

In the recent past, some studies are carried out to assess the Indoor PM10 and PM2.5 levels in school buildings and residential buildings in different Indian cities (**Table 1**). The major objectives of these studies were to assess PM exposure on children, who are more sensitive [22, 23, 26]. Kulshreshtha and Khare [21] have found average PM10 concentrations in the range of 373–894 μg m<sup>3</sup> in winter and 107–199 μg m<sup>3</sup> during summer in a residential building in Delhi. The PM2.5

> **Study Period/ Sampling duration**

24 hr

particles levels. Smoker'<sup>s</sup>

24 hr

24 hr

time

Jun 22 - Jul 2, 2007/

July 16–22, 2007/

July 23–27, 2007/

June 14–July 1, 2011,/ 8 hr., day

Winter (Dec.09 – Jan. Mar, 10) Summer (Apr.- Jun.,10,)/08 hr.

**Key Findings of the Study**

The classroom location and the movement of students in and out of the classrooms influence the PM concentrations.

Fine and coarse particles were generated by indoor sources i.e. dust re-suspension due to

children activities

The higher number of occupants and re-suspension of PM leads to elevated fine

people spend more time in indoor environment, be it office or at home.

IAQ by a factor of 2–7 can increase occupant's productivity in offices.

**Pollutant Concentration**

PM2.5:

PM2.5: 30.7 6.7 <sup>μ</sup>g/m<sup>3</sup> (Summer)

School PM2.5: 22 6 μg/ m<sup>3</sup> (Summer) PM10: 35 11 μg/ m<sup>3</sup> (Summer)

School PM2.5:

20.3 2.69 <sup>μ</sup>g/m<sup>3</sup> (Summer)

37.6 27.3 <sup>μ</sup>g/m<sup>3</sup> (Summer)

59.8 21.6 <sup>μ</sup>g/m<sup>3</sup> (Winter) and 13.5 4.1 <sup>μ</sup>g/m<sup>3</sup> (Summer) PM10:

irrespective of indoor or ambient environments [13].

*Environmental Sustainability - Preparing for Tomorrow*

**Author/ City Type of**

Saraga et al. [17]/ Goudi, Athens

Razali et al. [18] / Malaysia

Zwoździak et al. [19]/ Wrocław, Poland

**254**

**Building**

Office

Non-Smoker's Office

Museum PM2.5:

concentrations in the range of 197–713 μg m<sup>3</sup> in winter and 34–60 μg m<sup>3</sup> in summer while PM1 found in the range of 169–623 μg m<sup>3</sup> in winter and 23–36 μg m<sup>3</sup> in summer, respectively in a low and medium-income group house where emissions from kitchen are generally high due to Indian cooking style. The results indicate a higher level of PM concentration during the winter season. However, the level of PM2.5 and PM10 in western cold countries is comparatively very less [19, 25]. Recently, Gupta et al. [25] have reported PM2.5 concentration level as 116 <sup>67</sup> <sup>μ</sup>g m<sup>3</sup> in one of the office buildings in Delhi during the winter period. The higher level of PM2.5 might be due to the penetration of ambient PM2.5, which is generated from nearby high traffic roads.

The high level of indoor PM (PM10, PM2.5, and PM1.0) in the office building is an emerging issue in view of its adverse effects on working productivity and health. There is a need to assess it comprehensively at different locations in the city for different types of office buildings.

The present study is an attempt to assess the size of fractioned PM in different sections of the office buildings. The study has monitored the different size PM in different building sections like staff cabin, meeting/conference room, office halls, accountant room, and outside building in Delhi city. PM monitoring is carried out in three different types of buildings. The particle size distribution plot of each monitoring location has been carried out and compared to further correlate with the sources. The correlation between sites for a particular size PM is calculated along with the Indoor/outdoor ratio.

> Building II and Building III located at sites I, II and III, respectively. Sites I and II represent South Delhi, while site III represents Central Delhi, as shown in **Figure 1**. Building I is a traditional office building with old infrastructure, Building II is a newly constructed office space (with Modern Infrastructure) and Building III is an old Building, but maintained very well. The details of the buildings and surrounding

**Types of Building/ Features/ Old or**

close cabins, poor ventilation, congested place, approach, 30–40 years old, etc.

spacious Hall, New infrastructure, 1– 2 years old building, no open files, located at the lower ground floor, Office is part of a shopping mall having eateries, offices, coffee shops and retail shops etc.

Old and very well maintained building hall, high movement of people for meeting/discussions, no public dealing office, daily cleaning activities through **Surrounding Landuse features**

Located in the institutional area, Medium density traffic road outside building, residential area on one side of the building, and green forest area on the other

High-density traffic road, Car parking outside the building, covered by Residential area on three sides and open land on one

Smooth traffic movement outside, commercial area nearby and lots of green areas

side

side

**New (approx. age)**

South Delhi Modern office building, clean and

cleaning reagents, etc.

*Building types and surrounding features at site I, II, and III in Delhi.*

South Delhi Typical office building, lots of old files,

*Evaluation of Particulate Matter Pollution in Micro-Environments of Office…*

PM monitoring was carried out using a laser aerosol monitor (GRIMM Aerosol

Monitoring was carried out for 1 day each at all the three sites in December 2018 (Winter) on different dates. At each location of the building at all three selected sites, 15 minutes of measurement was recorded. The monitor was placed in the center of each room (about 1 m above the floor), which corresponds to the breathing zone of the sitting occupants, and the outdoor monitor was placed at least 1.5 m away from any obstacle at a height of 1 m above the ground. The details of the monitoring protocol followed are summarized in **Table 3**. The photographs of monitoring locations for Buildings I and II are shown in **Figure 2**, whereas photographs were not taken at site III due to security reasons. Based on the discussion with the office staff about their comfort and visualizing the situations of the Heating, Ventilating and Air Condition (HVAC) system, in each compartment of all three buildings, building I am categorized as poor ventilated, however, buildings II and III as good ventilated. Kulshreshtha and Khar [21] have correlated the

Technik Gmbh & Co. KG, Ainrig, Germany, Mini-LAS Model 11R) [27]. The instrument captures every single particle ranging from 0.25 to 32 μm and classifies it into 31 size range channels. The instrument was calibrated before monitoring. The data were recorded and stored at every 6-second interval. The monitor provides concentration levels at the cut of point of PM1.0, PM2.5, and PM10 which are generally monitored for health exposure and from a regulatory compliance

site features are described in **Table 2**.

**Locations Direction**

Building I/ Site I

Building II/ Site II

Building III/ Site III

**Table 2.**

Central Delhi

**wrt Centre of Delhi**

*DOI: http://dx.doi.org/10.5772/intechopen.95445*

point of view.

**257**

**3. Instrumentation and monitoring protocol**

## **2. Materials and methods**

## **2.1 Site description**

Three different types of office buildings are considered in the present study to assess the PM levels in the indoor environment. The buildings are named Building I,

**Figure 1.** *Delhi's map showing site I, II, and III.*

*Evaluation of Particulate Matter Pollution in Micro-Environments of Office… DOI: http://dx.doi.org/10.5772/intechopen.95445*


**Table 2.**

concentrations in the range of 197–713 μg m<sup>3</sup> in winter and 34–60 μg m<sup>3</sup> in summer while PM1 found in the range of 169–623 μg m<sup>3</sup> in winter and 23–36 μg m<sup>3</sup> in summer, respectively in a low and medium-income group house where emissions from kitchen are generally high due to Indian cooking style. The results indicate a higher level of PM concentration during the winter season. However, the level of PM2.5 and PM10 in western cold countries is comparatively very less [19, 25].

Recently, Gupta et al. [25] have reported PM2.5 concentration level as 116 <sup>67</sup> <sup>μ</sup>g m<sup>3</sup> in one of the office buildings in Delhi during the winter period. The higher level of PM2.5 might be due to the penetration of ambient PM2.5, which is generated from

The high level of indoor PM (PM10, PM2.5, and PM1.0) in the office building is an emerging issue in view of its adverse effects on working productivity and health. There is a need to assess it comprehensively at different locations in the city for

The present study is an attempt to assess the size of fractioned PM in different sections of the office buildings. The study has monitored the different size PM in different building sections like staff cabin, meeting/conference room, office halls, accountant room, and outside building in Delhi city. PM monitoring is carried out in three different types of buildings. The particle size distribution plot of each monitoring location has been carried out and compared to further correlate with the sources. The correlation between sites for a particular size PM is calculated along

Three different types of office buildings are considered in the present study to assess the PM levels in the indoor environment. The buildings are named Building I,

nearby high traffic roads.

different types of office buildings.

*Environmental Sustainability - Preparing for Tomorrow*

with the Indoor/outdoor ratio.

**2. Materials and methods**

**2.1 Site description**

**Figure 1.**

**256**

*Delhi's map showing site I, II, and III.*

*Building types and surrounding features at site I, II, and III in Delhi.*

Building II and Building III located at sites I, II and III, respectively. Sites I and II represent South Delhi, while site III represents Central Delhi, as shown in **Figure 1**. Building I is a traditional office building with old infrastructure, Building II is a newly constructed office space (with Modern Infrastructure) and Building III is an old Building, but maintained very well. The details of the buildings and surrounding site features are described in **Table 2**.

## **3. Instrumentation and monitoring protocol**

PM monitoring was carried out using a laser aerosol monitor (GRIMM Aerosol Technik Gmbh & Co. KG, Ainrig, Germany, Mini-LAS Model 11R) [27]. The instrument captures every single particle ranging from 0.25 to 32 μm and classifies it into 31 size range channels. The instrument was calibrated before monitoring. The data were recorded and stored at every 6-second interval. The monitor provides concentration levels at the cut of point of PM1.0, PM2.5, and PM10 which are generally monitored for health exposure and from a regulatory compliance point of view.

Monitoring was carried out for 1 day each at all the three sites in December 2018 (Winter) on different dates. At each location of the building at all three selected sites, 15 minutes of measurement was recorded. The monitor was placed in the center of each room (about 1 m above the floor), which corresponds to the breathing zone of the sitting occupants, and the outdoor monitor was placed at least 1.5 m away from any obstacle at a height of 1 m above the ground. The details of the monitoring protocol followed are summarized in **Table 3**. The photographs of monitoring locations for Buildings I and II are shown in **Figure 2**, whereas photographs were not taken at site III due to security reasons. Based on the discussion with the office staff about their comfort and visualizing the situations of the Heating, Ventilating and Air Condition (HVAC) system, in each compartment of all three buildings, building I am categorized as poor ventilated, however, buildings II and III as good ventilated. Kulshreshtha and Khar [21] have correlated the


*Note: Vol. – Volume of indoor space where monitoring was carried out. These volumes are calculated based on tentative measures of length, width, and height of indoor compartments.*

#### **Table 3.**

*Monitoring protocol adopted in each building.*

ventilation parameters with the comfort level of occupants in a residential building where poor indicate inadequate ventilation and a high potential for complaints and Good indicate satisfaction for all occupants.

The average concentrations of PM10, PM2.5, and PM1.0 in Building I were found

*Photographs showing monitoring location in building I and II (Note: Building III photographs not taken due to*

*Evaluation of Particulate Matter Pollution in Micro-Environments of Office…*

*DOI: http://dx.doi.org/10.5772/intechopen.95445*

matter was found higher in the account's department compartment and Halls E and

), 72 μg m�<sup>3</sup> (range 41–104 μg m�<sup>3</sup>

), respectively. The concentration of particulate

) and

to be 101 μg m�<sup>3</sup> (range 55–150 μg m�<sup>3</sup>

*Average PM concentration in different indoor rooms at building I.*

64 μg m�<sup>3</sup> (range 37–95 μg m�<sup>3</sup>

**Figure 2.**

**Figure 3.**

**259**

*security reason).*

## **4. Results and discussion**

## **4.1 Status of indoor PM10, PM2.5, and PM1 concentration**

Generally, the particles are monitored in terms of PM10 (particles having aerodynamic diameter ≤ 10 μm), PM2.5 (particles having aerodynamic diameter ≤ 2.5 μm), and PM1 (particle having aerodynamic diameter ≤ 1.0 μm) for regulatory as well as health exposure assessment in ambient as well as in the indoor environment. Additionally, the particles are defined as Ultrafine (<1 μm), Fine or accumulation mode (1 to 2.5 μm) and Coarse particle (> 2.5 μm) as described by Tiwary & Williams [28]. A similar assessment was carried out in the present study as well to evaluate the level of these particles. The monitored data of PM10, PM2.5, and PM1.0 concentrations were analyzed statistically and are summarized in graphical form in **Figures 3** to **5** for Buildings I to III, respectively.

*Evaluation of Particulate Matter Pollution in Micro-Environments of Office… DOI: http://dx.doi.org/10.5772/intechopen.95445*

#### **Figure 2.**

ventilation parameters with the comfort level of occupants in a residential building where poor indicate inadequate ventilation and a high potential for complaints and

*Note: Vol. – Volume of indoor space where monitoring was carried out. These volumes are calculated based on*

**Location Monitoring Details Monitoring Locations**

1. Halls A-I mainly occupied by staffs (Vol.315–350 m<sup>3</sup> of each) 2. Account department (Vol. 84 m<sup>3</sup>

5. Common area at entrance (360 m<sup>3</sup>

1. Halls mainly occupied by clerical/ technical staffs, (Vol. 210–280 m3

6. Outdoor air in front of the entrance gate. PM monitor was placed at an average height of 1 m above ground. Poor Ventilation System

)

)

)

)

)

)

6. A common indoor area at the entrance (20 m<sup>3</sup> and Reception (60 m<sup>3</sup>

PM monitor was placed at an average height of 1 m above ground. Good Ventilation System

1.Meeting Room/Hall (Vol. 12000 m<sup>3</sup>

PM monitor was placed on the table of an average height of 1.2 m in the meeting room and chair of height 0.40–0.45 m in the

2.Common Indoor area. (3000 m<sup>3</sup>

)

3.Meeting rooms (150 m<sup>3</sup>

2. Staff Cabin (Vol. 27m<sup>3</sup>

4.Meeting room (215 m<sup>3</sup>

5. Cafeteria/Pantry (60 m<sup>3</sup>

7. Outdoor air at entrance.

common area

Good Ventilation System

3. Conference (315 m<sup>3</sup>

4.Conference room (294 m<sup>3</sup>

)

)

)

)

)

Building I Monitoring was carried out in the second

*Environmental Sustainability - Preparing for Tomorrow*

Building II Monitoring was carried out in the first

Building III Monitoring was carried out during the last week of December 2018 from 10 am to 1 pm for one day. The monitoring was carried out for a period of 15 minutes each

at the selected locations.

*tentative measures of length, width, and height of indoor compartments.*

week of December 2018, during 10 am to 3 pm, monitoring was carried out for 15 minutes at each of the selected locations.

week of December 2018, during 11 am to 3 pm, monitoring was carried out for 15 minutes at each of the selected locations.

Generally, the particles are monitored in terms of PM10 (particles having aero-

dynamic diameter ≤ 10 μm), PM2.5 (particles having aerodynamic diameter ≤ 2.5 μm), and PM1 (particle having aerodynamic diameter ≤ 1.0 μm) for regulatory as well as health exposure assessment in ambient as well as in the indoor environment. Additionally, the particles are defined as Ultrafine (<1 μm), Fine or accumulation mode (1 to 2.5 μm) and Coarse particle (> 2.5 μm) as described by Tiwary & Williams [28]. A similar assessment was carried out in the present study as well to evaluate the level of these particles. The monitored data of PM10, PM2.5, and PM1.0 concentrations were analyzed statistically and are summarized in graph-

Good indicate satisfaction for all occupants.

*Monitoring protocol adopted in each building.*

**4.1 Status of indoor PM10, PM2.5, and PM1 concentration**

ical form in **Figures 3** to **5** for Buildings I to III, respectively.

**4. Results and discussion**

**Table 3.**

**258**

*Photographs showing monitoring location in building I and II (Note: Building III photographs not taken due to security reason).*

The average concentrations of PM10, PM2.5, and PM1.0 in Building I were found to be 101 μg m�<sup>3</sup> (range 55–150 μg m�<sup>3</sup> ), 72 μg m�<sup>3</sup> (range 41–104 μg m�<sup>3</sup> ) and 64 μg m�<sup>3</sup> (range 37–95 μg m�<sup>3</sup> ), respectively. The concentration of particulate matter was found higher in the account's department compartment and Halls E and

**Figure 3.** *Average PM concentration in different indoor rooms at building I.*

The correlation coefficient (r2

*DOI: http://dx.doi.org/10.5772/intechopen.95445*

in **Tables 4**-**6** and **Figure 6**.

was 2.6–10 μm with 40% of the total mass.

**261**

) values for PM10, PM2.5 and PM1 were estimated to

be �0.35, �0.55, �0.54, respectively at Building I and � 0.19, �0.28, �0.28 at Building II. The negative correlation means larger halls/rooms increase the dispersion of particles, which results in low concentrations. It is also important to note that particulate concentrations at Building I (Old infrastructure and poor ventilation) have a good negative correlation with the size (volume) of the indoor compartments/rooms as compared to Building II (Modern infrastructure and good ventilation). It might be due to the impact of a good ventilation system, which dominated the impact of room size. Further, the fine and ultra-fine particles have a

*Evaluation of Particulate Matter Pollution in Micro-Environments of Office…*

good correlation with the size of the room compared to coarser particles.

particles and are generated from wind-blown dust, sea spray etc. [29, 30].

In the present study, particle size between 0.25 μm to 32 μm is monitored at different 31 intervals. The fraction of different sized particle mass is compared between different indoor work environments and then with the ambient air. The fraction of total mass (%) contributed by different size range particles are described

In Building I, the maximum mass was contributed by particles of size range 0.25– 1.0 μm, in the range of 33–55% in Halls (Staff sitting area with half-sized individual cabin). These values for meeting rooms were even higher, being in the range of 60–75% (empty room during monitoring). The second dominant particle size range was 2.5– 10 μm, which contributed 27–40% of the total mass in Halls, 12–21% in meeting rooms, however, the contribution at the common building entrance was 38%. The proportion of particle size 10–32 μm was between 11 and 24% (except Hall D, 5% only), 4–7% in meeting rooms, and 18% at the common entrance gate. In ambient air the mass contribution by particles of size 0.25–1.0 μm, 2.5-10 μm and 10-32 μm was found as 7%, 48%, and 41% respectively, which seems to be opposite to the trend of mass distribution in the different indoor environment except for the common entrance area.

In Building II, which is a modern office and located in the lower ground floor of

In Building III, a similar trend was observed for the meeting hall and common Indoor lobby area during non-meeting hours. However, during meetings, the proportion of ultrafine particles decreased from 78–64%, whereas particles of 2.6– 10 μm increased from 13–22%. This indicates the re-suspension of particles due to the movement of people in the indoor environment. In the meeting hall, approx. 60–70 people were present during the meeting, which enhanced the particle concentrations even in the presence of sufficient ventilation systems.

a shopping mall (no direct opening in the ambient environment), the trend of particle size distribution was more or less similar with more percentage of ultrafine particles (0.25–1.0 μm); in the range of 36–64% in Office Halls, 82–86% in conference/meeting rooms, 30% at Main entrance of the Mall. In this building, the pantry area is near to the office staff sitting area and where the dominant particle size range

The particles in the atmosphere may be primary or secondary, solid, or liquid depending upon their formation/sources. In the air, particles remain in suspended form for a longer time depending upon their sizes, which vary from very ultra-fine particles (nm) to coarse fine particles (μm). In literature, it is reported that ambient air particles below 2.5 μm are called fine particles which are further divided into transient nuclei (<0.1 μm) and accumulation range (0.1–2.5 μm). The fine particles are mainly generated due to primary emissions (controlled combustion activities, bio-aerosols, secondary aerosol, room air freshener, room cleaner spray in Indoor environments etc.). The particles in the size range of 2.5–100 μm are called coarse

**4.2 Particle size distribution in indoor work environment**

**Figure 4.** *Average PM concentration in different indoor rooms at building II.*

**Figure 5.** *Average PM concentration in different indoor rooms at building III.*

Hall A, which might be due to higher activities and deposition of particles on files that move here and there on daily basis along with the staff.

At Building II, the average levels of PM10, PM2.5, and PM1 were 88 μg m�<sup>3</sup> (range 33–136 μg m�<sup>3</sup> ), 70 μg m�<sup>3</sup> (range 30–84 μg m�<sup>3</sup> ) and 63 μg m�<sup>3</sup> (range 28– 73 μg m�<sup>3</sup> ), respectively. The concentrations of all three fractions of PM were found higher at the reception area and in the cafeteria/ pantry area, which is directly correlated with the high activity area. The high level of PM10 at reception and halls A and B (next to the reception area) might be due to the high movement of staff and visitors in the office compared to other office areas.

At Building III, the concentrations of PM10, PM2.5, and PM1 were found in the range of 119–129 μg m�<sup>3</sup> , 102–106 μg m�<sup>3</sup> and 90–99 μg m�<sup>3</sup> , respectively during non-meeting hours, however, these values during meeting hours were found to be high as 216–330 μg m�<sup>3</sup> , 188–268 μg m�<sup>3</sup> and 171–237 μg m�<sup>3</sup> , respectively. This difference might be due to the penetration of PM due to the opening and closing of doors from the entrance gate to the lobby area and then the lobby gate to outside due to the high movement of people. The meeting was going during the monitoring and about 60–70 persons were present in the meeting hall.

Each of the compartments of respective buildings varied notably in dimension, number of doors, frequency of closing and opening, and the number of units of air filtration vents as described in **Tables 2** and **3**. The combination of these variables provided highly variable ventilation conditions and huge differences in indoor PM concentrations. A higher proportion of ultrafine particles also indicates the possibility of bio-aerosols in indoor spaces, which needs to be assessed and managed from a health impact point of view.

Further, the correlation between the size of the room/halls (indoor volume, m<sup>3</sup> ) and size segregated particulate concentrations were estimated for Building I and II.

*Evaluation of Particulate Matter Pollution in Micro-Environments of Office… DOI: http://dx.doi.org/10.5772/intechopen.95445*

The correlation coefficient (r2 ) values for PM10, PM2.5 and PM1 were estimated to be �0.35, �0.55, �0.54, respectively at Building I and � 0.19, �0.28, �0.28 at Building II. The negative correlation means larger halls/rooms increase the dispersion of particles, which results in low concentrations. It is also important to note that particulate concentrations at Building I (Old infrastructure and poor ventilation) have a good negative correlation with the size (volume) of the indoor compartments/rooms as compared to Building II (Modern infrastructure and good ventilation). It might be due to the impact of a good ventilation system, which dominated the impact of room size. Further, the fine and ultra-fine particles have a good correlation with the size of the room compared to coarser particles.

#### **4.2 Particle size distribution in indoor work environment**

The particles in the atmosphere may be primary or secondary, solid, or liquid depending upon their formation/sources. In the air, particles remain in suspended form for a longer time depending upon their sizes, which vary from very ultra-fine particles (nm) to coarse fine particles (μm). In literature, it is reported that ambient air particles below 2.5 μm are called fine particles which are further divided into transient nuclei (<0.1 μm) and accumulation range (0.1–2.5 μm). The fine particles are mainly generated due to primary emissions (controlled combustion activities, bio-aerosols, secondary aerosol, room air freshener, room cleaner spray in Indoor environments etc.). The particles in the size range of 2.5–100 μm are called coarse particles and are generated from wind-blown dust, sea spray etc. [29, 30].

In the present study, particle size between 0.25 μm to 32 μm is monitored at different 31 intervals. The fraction of different sized particle mass is compared between different indoor work environments and then with the ambient air. The fraction of total mass (%) contributed by different size range particles are described in **Tables 4**-**6** and **Figure 6**.

In Building I, the maximum mass was contributed by particles of size range 0.25– 1.0 μm, in the range of 33–55% in Halls (Staff sitting area with half-sized individual cabin). These values for meeting rooms were even higher, being in the range of 60–75% (empty room during monitoring). The second dominant particle size range was 2.5– 10 μm, which contributed 27–40% of the total mass in Halls, 12–21% in meeting rooms, however, the contribution at the common building entrance was 38%. The proportion of particle size 10–32 μm was between 11 and 24% (except Hall D, 5% only), 4–7% in meeting rooms, and 18% at the common entrance gate. In ambient air the mass contribution by particles of size 0.25–1.0 μm, 2.5-10 μm and 10-32 μm was found as 7%, 48%, and 41% respectively, which seems to be opposite to the trend of mass distribution in the different indoor environment except for the common entrance area.

In Building II, which is a modern office and located in the lower ground floor of a shopping mall (no direct opening in the ambient environment), the trend of particle size distribution was more or less similar with more percentage of ultrafine particles (0.25–1.0 μm); in the range of 36–64% in Office Halls, 82–86% in conference/meeting rooms, 30% at Main entrance of the Mall. In this building, the pantry area is near to the office staff sitting area and where the dominant particle size range was 2.6–10 μm with 40% of the total mass.

In Building III, a similar trend was observed for the meeting hall and common Indoor lobby area during non-meeting hours. However, during meetings, the proportion of ultrafine particles decreased from 78–64%, whereas particles of 2.6– 10 μm increased from 13–22%. This indicates the re-suspension of particles due to the movement of people in the indoor environment. In the meeting hall, approx. 60–70 people were present during the meeting, which enhanced the particle concentrations even in the presence of sufficient ventilation systems.

Hall A, which might be due to higher activities and deposition of particles on files

higher at the reception area and in the cafeteria/ pantry area, which is directly correlated with the high activity area. The high level of PM10 at reception and halls A and B (next to the reception area) might be due to the high movement of staff and

At Building II, the average levels of PM10, PM2.5, and PM1 were 88 μg m�<sup>3</sup> (range

At Building III, the concentrations of PM10, PM2.5, and PM1 were found in the

, 102–106 μg m�<sup>3</sup> and 90–99 μg m�<sup>3</sup>

, 188–268 μg m�<sup>3</sup> and 171–237 μg m�<sup>3</sup>

Each of the compartments of respective buildings varied notably in dimension, number of doors, frequency of closing and opening, and the number of units of air filtration vents as described in **Tables 2** and **3**. The combination of these variables provided highly variable ventilation conditions and huge differences in indoor PM concentrations. A higher proportion of ultrafine particles also indicates the possibility of bio-aerosols in indoor spaces, which needs to be assessed and managed

Further, the correlation between the size of the room/halls (indoor volume, m<sup>3</sup>

and size segregated particulate concentrations were estimated for Building I and II.

difference might be due to the penetration of PM due to the opening and closing of doors from the entrance gate to the lobby area and then the lobby gate to outside due to the high movement of people. The meeting was going during the monitoring

non-meeting hours, however, these values during meeting hours were found to be

), respectively. The concentrations of all three fractions of PM were found

) and 63 μg m�<sup>3</sup> (range 28–

, respectively during

, respectively. This

)

that move here and there on daily basis along with the staff.

visitors in the office compared to other office areas.

*Average PM concentration in different indoor rooms at building III.*

*Average PM concentration in different indoor rooms at building II.*

*Environmental Sustainability - Preparing for Tomorrow*

and about 60–70 persons were present in the meeting hall.

), 70 μg m�<sup>3</sup> (range 30–84 μg m�<sup>3</sup>

33–136 μg m�<sup>3</sup>

range of 119–129 μg m�<sup>3</sup>

high as 216–330 μg m�<sup>3</sup>

from a health impact point of view.

73 μg m�<sup>3</sup>

**260**

**Figure 5.**

**Figure 4.**


**Table 5.**

It is observed that the proportion of finer particles is maximum in the indoor environment where the activity level is minimum (meeting rooms), followed by staff sitting area and then common building entrance (high people movement). It indicates that ambient air particles are more influenced by windblown dust particles from road and construction dust and natural dust. The particle size distribution indoor indicates the possibility of accumulated particles and bio-aerosol which are

generally found in the range of fine particle size (diameter < 1 μm).

*Proportion of mass (%) contributed by different size particles in building I, II, and III.*

**Particle Size Range (μm)**

**Table 6.**

**Figure 6.**

**263**

**Meeting Hall (No meeting)**

*DOI: http://dx.doi.org/10.5772/intechopen.95445*

**Common Area (No meeting)**

*Evaluation of Particulate Matter Pollution in Micro-Environments of Office…*

0.25–1.0 78 62 64 73 39 1.1–2.5 6 10 9 8 8 2.6–10 13 25 22 16 35 10.1–32 3 3 5 3 19

*Proportion of mass (%) contributed by different size particles in different indoor compartments of building III.*

**Meeting Hall (With Meeting)**

**Common Area (With meeting)** **Ambient Air**

 *II.*

*Proportion of mass (%) contributed by different size particles in different indoor compartments of building*


*Evaluation of Particulate Matter Pollution in Micro-Environments of Office… DOI: http://dx.doi.org/10.5772/intechopen.95445*

**Table 6.**

*Proportion of mass (%) contributed by different size particles in different indoor compartments of building III.*

**Figure 6.**

*Proportion of mass (%) contributed by different size particles in building I, II, and III.*

It is observed that the proportion of finer particles is maximum in the indoor environment where the activity level is minimum (meeting rooms), followed by staff sitting area and then common building entrance (high people movement). It indicates that ambient air particles are more influenced by windblown dust particles from road and construction dust and natural dust. The particle size distribution indoor indicates the possibility of accumulated particles and bio-aerosol which are generally found in the range of fine particle size (diameter < 1 μm).

**Particle Size**

**262**

**Hall A Hall B Hall C Hall D Hall E Hall I Accounts** 

**Department**

 **Meeting Room 1 Meeting Room 2 Common Entrance**

 **Outside (Ambient Air)**

> **Range (μm)**

0.25–1.0

1.1–2.5 2.6–10

10–32

**Table 4.** *Proportion*

 *of mass (%) contributed*

**Particle Size**

**Hall A Hall B Hall C Hall D Common Area (Lobby)**

 **Staff Cabin Conference**

 **Room Meeting Hall Cafeteria**

 **Reception**

 **Main Entrance**

 **Ambient Air**

> **Range (μm)**

0.25–1.0

1.1–2.5

2.6–10

10–32

**Table 5.** *Proportion*

 *of mass (%) contributed*

 *by different size particles in different indoor* 

22

 19

 26

 4

1

3 *compartments*

 *of building II.*

0

1

21

 9

10

44

 31

 37

 12

 21

 8

 7

 7

 10

 38

 36

 55

 64

78

9 11

18

8

7

40

 28

47

31

8

8

5

9

 9

13

7

70

82

86

 30

 53

30

18

 *by different size particles in the different indoor* 

11

 18

 12

 5

 24

 14

17 *compartment*

 *of building I.*

4

7

18

 40

 27

 27

 31

 35

 27

32

8

 6

 6

 8

 7

 7

8

9 12

21

38

10

9

 41

 48

 55

 55

 33

 50

43

75

60

35

7

5

48

41

*Environmental Sustainability - Preparing for Tomorrow*

Norhidayah et al. [31] also found a dominant particle size range 0.3–0.5 μm in an office building in Malaysia and reported printing and photocopier machines as the major source of particles which is supported by work carried out by Massey and Taneja [13]. They have found that photocopier and printer machines generated accumulation phase particles i.e., 0.25–1.0 μm, and air freshener and cleaner generate particles of size l μm. Similarly, Tang et al. [32] reported a significant increase in fine and ultra-fine particle concentration in 43 out 62 office's rooms. They reported the average size of emitted particles in the range from 0.23 and 20 μm.

In Building I, the I/O of ultrafine particles (0.25-1 μm) was found higher as compared to fine and coarse sized particles in all indoor compartments of the building. The I/O ratio of ultra-fine particles in the meeting/conference room (nonactive area) was found maximum in the range of 1.6–1.7 when compared to other compartments of the building where office staff movement was more (0.5–1.1). Secondly, particles of size 1.1–2.5 have a higher I/O ratio in the range of 0.1–0.4. The I/O of coarse sized particles in the range of 10.1- 32 μm is lowest in all building

*Evaluation of Particulate Matter Pollution in Micro-Environments of Office…*

In Building II, the I/O of ultrafine particles was found higher in the range of 0.6–1.2 (except Hall C of 0.2) compared to fine and coarse sized particles in all indoor compartments of the building. The particle size of 1.1–2.5 μm and 2.6-10 μm was more or less similar in the range of 0.1–0.4 except the cafeteria/pantry and main entrance. The values at the cafeteria/pantry were 0.5 for both sizes ranged particles and 1.2 and 1.5 for the main entrance area. The I/O of coarse sized particles in the range of 10.1- 32 μm is lowest in all building compartments (up to 0.2). The I/O ratio pattern of Building III is more or less similar to Building I during non-meeting hours which is found to be 0.8, 0.3, 0.2, and 0.1 in the meeting hall for particle sizes of 0.25–1.0 μm, 1.1–2.5 μm, 2.6-10 μm and 10.1–32 μm, respectively. However, during meeting hours, these I/O values were found to be higher as 1.9, 1.4, 0.7 and 0.3, respectively. The occupants found the I/O ratio in Building III higher because of the opening and closing of the door many times during the

It is inferred that fine and ultrafine particles have higher I/O at all three sites, which might be due to the presence of Indoor sources and/or poor ventilation. Building II and III are well maintained, ventilated, and have modern infrastructure compared to Building I. This is reflected by low I/O values in all indoor compartments of Building II compared to Building I for ultrafine and fine particles. At Building III, there were no open files on desks, no cafeteria activities like Building II, however, still I/O was found >1 for the finer particles. Based on the discussions, it was found that regular cleaning of the tables, chairs and other areas was carried out through cleaning spray in the meeting room, which might generate fine aerosols. Similar observations were found by Goyal and Kumar [33], they found that I/O ratio for PM10, PM2.5 and PM1.0 varied from 0.37–3.1, 0.2–3.2 and 0.17–2.9 respectively, at a commercial building in Delhi city. In one of the office buildings in Delhi,

PM2.5 sources exist in the building apart from infiltration from outdoors [25]. The findings in developed countries also indicate average I/O ratios of PM2.5 between 0.4 and 0.9 in an office room in Beijing and Xi'an cities in China [34, 35] and

The analysis indicates that fine and ultrafine particles are dominantly generated from indoor activities at the monitoring location, which is not directly connected with outdoor gate (e.g. reception area, common entrance area etc). High I/O ratio for ultrafine and fine particles neglect the hypothesis of intrusion of outside PM in a mechanical ventilated building as coarse particles do not have

Adequate and properly designed ventilation systems are the most effective strategies for achieving IAQ objectives. Smart planning of building uses and internal layout may help prevent many unnecessary IAQ problems. The mixed-use buildings having common facilities like Xerox facilities, pantry area among others should be properly ventilated and disconnected from the main office sitting area by the

, which indicates that indoor

the I/O ratio of PM2.5 was found to be 0.28–1.07 μg m<sup>3</sup>

0.62 0.14 in Milan, Italy [36].

**5. IAQ management approach**

such trend in I/O ratio.

**265**

compartments (up to 0.1).

*DOI: http://dx.doi.org/10.5772/intechopen.95445*

monitoring period.

### **4.3 The ratio of Indoor/Outdoor (I/O) PM Concentrations**

The I/O ratio of a pollutant is generally calculated to evaluate the possibility of intrusion of outdoor pollution inside the building. In the present study, the I/O ratio of size segregated PM (range 0.25–1.0 μm, 1.1–2.5 μm, 2.6–10 μm, and 10.1–32 μm) is calculated for each compartment of each building where monitoring was carried out as shown in **Figure 7**.

**Figure 7.** *Indoor/outdoor (I/O) ratio of size segregated PM in building I, II, and III.*

*Evaluation of Particulate Matter Pollution in Micro-Environments of Office… DOI: http://dx.doi.org/10.5772/intechopen.95445*

In Building I, the I/O of ultrafine particles (0.25-1 μm) was found higher as compared to fine and coarse sized particles in all indoor compartments of the building. The I/O ratio of ultra-fine particles in the meeting/conference room (nonactive area) was found maximum in the range of 1.6–1.7 when compared to other compartments of the building where office staff movement was more (0.5–1.1). Secondly, particles of size 1.1–2.5 have a higher I/O ratio in the range of 0.1–0.4. The I/O of coarse sized particles in the range of 10.1- 32 μm is lowest in all building compartments (up to 0.1).

In Building II, the I/O of ultrafine particles was found higher in the range of 0.6–1.2 (except Hall C of 0.2) compared to fine and coarse sized particles in all indoor compartments of the building. The particle size of 1.1–2.5 μm and 2.6-10 μm was more or less similar in the range of 0.1–0.4 except the cafeteria/pantry and main entrance. The values at the cafeteria/pantry were 0.5 for both sizes ranged particles and 1.2 and 1.5 for the main entrance area. The I/O of coarse sized particles in the range of 10.1- 32 μm is lowest in all building compartments (up to 0.2).

The I/O ratio pattern of Building III is more or less similar to Building I during non-meeting hours which is found to be 0.8, 0.3, 0.2, and 0.1 in the meeting hall for particle sizes of 0.25–1.0 μm, 1.1–2.5 μm, 2.6-10 μm and 10.1–32 μm, respectively. However, during meeting hours, these I/O values were found to be higher as 1.9, 1.4, 0.7 and 0.3, respectively. The occupants found the I/O ratio in Building III higher because of the opening and closing of the door many times during the monitoring period.

It is inferred that fine and ultrafine particles have higher I/O at all three sites, which might be due to the presence of Indoor sources and/or poor ventilation. Building II and III are well maintained, ventilated, and have modern infrastructure compared to Building I. This is reflected by low I/O values in all indoor compartments of Building II compared to Building I for ultrafine and fine particles. At Building III, there were no open files on desks, no cafeteria activities like Building II, however, still I/O was found >1 for the finer particles. Based on the discussions, it was found that regular cleaning of the tables, chairs and other areas was carried out through cleaning spray in the meeting room, which might generate fine aerosols. Similar observations were found by Goyal and Kumar [33], they found that I/O ratio for PM10, PM2.5 and PM1.0 varied from 0.37–3.1, 0.2–3.2 and 0.17–2.9 respectively, at a commercial building in Delhi city. In one of the office buildings in Delhi, the I/O ratio of PM2.5 was found to be 0.28–1.07 μg m<sup>3</sup> , which indicates that indoor PM2.5 sources exist in the building apart from infiltration from outdoors [25]. The findings in developed countries also indicate average I/O ratios of PM2.5 between 0.4 and 0.9 in an office room in Beijing and Xi'an cities in China [34, 35] and 0.62 0.14 in Milan, Italy [36].

The analysis indicates that fine and ultrafine particles are dominantly generated from indoor activities at the monitoring location, which is not directly connected with outdoor gate (e.g. reception area, common entrance area etc). High I/O ratio for ultrafine and fine particles neglect the hypothesis of intrusion of outside PM in a mechanical ventilated building as coarse particles do not have such trend in I/O ratio.

### **5. IAQ management approach**

Adequate and properly designed ventilation systems are the most effective strategies for achieving IAQ objectives. Smart planning of building uses and internal layout may help prevent many unnecessary IAQ problems. The mixed-use buildings having common facilities like Xerox facilities, pantry area among others should be properly ventilated and disconnected from the main office sitting area by the

Norhidayah et al. [31] also found a dominant particle size range 0.3–0.5 μm in an office building in Malaysia and reported printing and photocopier machines as the major source of particles which is supported by work carried out by Massey and Taneja [13]. They have found that photocopier and printer machines generated accumulation phase particles i.e., 0.25–1.0 μm, and air freshener and cleaner generate particles of size l μm. Similarly, Tang et al. [32] reported a significant increase in fine and ultra-fine particle concentration in 43 out 62 office's rooms. They reported

The I/O ratio of a pollutant is generally calculated to evaluate the possibility of intrusion of outdoor pollution inside the building. In the present study, the I/O ratio of size segregated PM (range 0.25–1.0 μm, 1.1–2.5 μm, 2.6–10 μm, and 10.1–32 μm) is calculated for each compartment of each building where monitoring was carried

the average size of emitted particles in the range from 0.23 and 20 μm.

**4.3 The ratio of Indoor/Outdoor (I/O) PM Concentrations**

*Environmental Sustainability - Preparing for Tomorrow*

out as shown in **Figure 7**.

**Figure 7.**

**264**

*Indoor/outdoor (I/O) ratio of size segregated PM in building I, II, and III.*

air-filter. There should be proper storage spaces for the old office records. The partitioning of the layout may affect the effectiveness of air distribution resulting in stagnant zones with poor air quality, which needs to be taken care of by architectural planning and ventilation engineering. Housekeeping is important in preventing IAQ problems as it keeps dust levels down and removes dirt, which could otherwise become sources of contamination, including mold growth. The cleaning schedule should be arranged according to occupancy patterns and activity levels. Daily cleaning of surfaces and vacuuming of floors is advisable for areas with high occupancy or which are in constant use during the day. The use of eco-friendly or non-toxic chemicals for cleaning also improves IAQ.

**Declaration of conflicting interests**

*DOI: http://dx.doi.org/10.5772/intechopen.95445*

**Author details**

**267**

Naraina, New Delhi, India

provided the original work is properly cited.

research, authorship, and/or publication of this article.

*Evaluation of Particulate Matter Pollution in Micro-Environments of Office…*

The author(s) declared no potential conflicts of interest with respect to the

Saurabh Mendiratta, Sunil Gulia\*, Prachi Goyal and Sanjeev Kumar Goyal

\*Address all correspondence to: s\_gulia@neeri.res.in; sunilevs@gmail.com

CSIR-National Environmental Engineering Research Institute, Delhi Zonal Centre,

© 2021 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium,

Numerous studies are available that strongly suggest that foliage plants in offices may improve health and reduce discomfort symptoms [37, 38] Kobayashi et al. [39] tested more than 20 plants to improve indoor air quality. Gawrońska, & Bakera [40] concluded that Spider plants (*Chlorophytum comosum* L.) phytoremediation particulate matter from indoor air. Torpy & Zavattaro [41] tested *Chlorophytum comosum* (Spider Plant) and *Epipremnum aureum* (Pothos) and concluded that indoor green plants can significantly reduce particulate matter concentration and hence improve Indoor Environment Quality (IEQ).

### **6. Conclusion**

The study has focussed on the assessment of size segregated particulate matter (PM) in different indoor environments of three office buildings located in different parts of Delhi city. The PM concentrations were found higher in the indoor environment where activities were high but had poor ventilation. The levels of PM in the old building were found higher compared to the newly built office building having the modern infrastructure and well-maintained activities/files etc. The presence of people and activities generated re-suspended particles greater than 2.5 μg m�<sup>3</sup> , which is noticed when compared PM concentration in the common area, reception area with office cabin area and meeting room with and without meeting hours. The indoor/outdoor ratios were greater for ultrafine and fine particles than coarser particles, which indicates presence of sources of finer particles indoors in all three buildings. Further, the meeting room/conference hall has a higher portion of ultra-fine particles of the total PM concentration. Further, correlation between room size (Indoor volume) and size segregated PM concentration found good negative correlation with finer particles in both buildings. This helps the indoor air quality managers to decide the suitable technology for the improvement of IAQ in different compartments of an office building.

Currently, the country does not have any IAQ standards nor have any monitoring protocol for Indoor air quality assessment. Therefore, it is suggested that country should come out with regulatory framework for IAQ assessment in different types of buildings. The findings of the present study suggest that any proposed IAQ standards should cover ultrafine (PM1) and fine particle (PM2.5) instead of coarser particles especially in office buildings.

## **Authors' contribution**

Saurabh Mendiratta: Monitoring and Original writing, Sunil Gulia: Methodology, Data Analysis, Review, and Re-writing, Prachi Goyal: Monitoring and review, S.K. Goyal: Concept, Methods and Review.

*Evaluation of Particulate Matter Pollution in Micro-Environments of Office… DOI: http://dx.doi.org/10.5772/intechopen.95445*

## **Declaration of conflicting interests**

air-filter. There should be proper storage spaces for the old office records. The partitioning of the layout may affect the effectiveness of air distribution resulting in stagnant zones with poor air quality, which needs to be taken care of by architec-

Numerous studies are available that strongly suggest that foliage plants in offices may improve health and reduce discomfort symptoms [37, 38] Kobayashi et al. [39] tested more than 20 plants to improve indoor air quality. Gawrońska, & Bakera [40] concluded that Spider plants (*Chlorophytum comosum* L.) phytoremediation particulate matter from indoor air. Torpy & Zavattaro [41] tested *Chlorophytum comosum* (Spider Plant) and *Epipremnum aureum* (Pothos) and concluded that indoor green plants can significantly reduce particulate matter concentration and

The study has focussed on the assessment of size segregated particulate matter (PM) in different indoor environments of three office buildings located in different parts of Delhi city. The PM concentrations were found higher in the indoor environment where activities were high but had poor ventilation. The levels of PM in the old building were found higher compared to the newly built office building having the modern infrastructure and well-maintained activities/files etc. The presence of people and activities generated re-suspended particles greater than

, which is noticed when compared PM concentration in the common

Currently, the country does not have any IAQ standards nor have any monitoring protocol for Indoor air quality assessment. Therefore, it is suggested that country should come out with regulatory framework for IAQ assessment in different types of buildings. The findings of the present study suggest that any proposed IAQ standards should cover ultrafine (PM1) and fine particle (PM2.5) instead of coarser

Saurabh Mendiratta: Monitoring and Original writing, Sunil Gulia: Methodology, Data Analysis, Review, and Re-writing, Prachi Goyal: Monitoring and review, S.K.

area, reception area with office cabin area and meeting room with and without meeting hours. The indoor/outdoor ratios were greater for ultrafine and fine particles than coarser particles, which indicates presence of sources of finer particles indoors in all three buildings. Further, the meeting room/conference hall has a higher portion of ultra-fine particles of the total PM concentration. Further, correlation between room size (Indoor volume) and size segregated PM concentration found good negative correlation with finer particles in both buildings. This helps the indoor air quality managers to decide the suitable technology for the improvement

tural planning and ventilation engineering. Housekeeping is important in preventing IAQ problems as it keeps dust levels down and removes dirt, which could otherwise become sources of contamination, including mold growth. The cleaning schedule should be arranged according to occupancy patterns and activity levels. Daily cleaning of surfaces and vacuuming of floors is advisable for areas with high occupancy or which are in constant use during the day. The use of eco-friendly

or non-toxic chemicals for cleaning also improves IAQ.

*Environmental Sustainability - Preparing for Tomorrow*

hence improve Indoor Environment Quality (IEQ).

of IAQ in different compartments of an office building.

particles especially in office buildings.

Goyal: Concept, Methods and Review.

**Authors' contribution**

**266**

**6. Conclusion**

2.5 μg m�<sup>3</sup>

The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

## **Author details**

Saurabh Mendiratta, Sunil Gulia\*, Prachi Goyal and Sanjeev Kumar Goyal CSIR-National Environmental Engineering Research Institute, Delhi Zonal Centre, Naraina, New Delhi, India

\*Address all correspondence to: s\_gulia@neeri.res.in; sunilevs@gmail.com

© 2021 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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[20] Taneja, A., Saini, R., & Masih, A. (2008). Indoor air quality of houses located in the urban environment of Agra, India. *Annals of the New York Academy of Sciences*, *1140*(1), 228–245.

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(1), 537–566.

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[10] Goel, S., Patidar, R., Baxi, K., & Thakur, R. S. (2017). Investigation of particulate matter performances in relation to chalk selection in classroom environment. *Indoor and Built Environment*, *26*(1), 119–131.

[11] Majumdar, D., Gajghate, D. G., Pipalatkar, P., & Chalapati Rao, C. V. (2012). Assessment of airborne fine particulate matter and particle size distribution in settled chalk dust during writing and dusting exercises in a classroom. *Indoor and Built Environment*, *21*(4), 541–551.

[12] Khan, S. A. R., Yu, Z., Sharif, A., & Golpîra, H. (2020). Determinants of economic growth and environmental sustainability in South Asian Association for Regional Cooperation: evidence from panel ARDL. *Environmental Science and Pollution Research*, 1–13.

[13] Li, N., Georas, S., Alexis, N., Fritz, P., Xia, T., Williams, M. A., ... & Nel, A. (2016). A work group report on ultrafine particles (AAAAI) why ambient ultrafine and engineered nanoparticles should receive special attention for possible adverse health outcomes in humans. *The Journal of allergy and clinical immunology*, *138*(2), 386.

*Evaluation of Particulate Matter Pollution in Micro-Environments of Office… DOI: http://dx.doi.org/10.5772/intechopen.95445*

[14] Wargocki, P., Wyon, D. P., Baik, Y. K., Clausen, G., & Fanger, P. O. (1999). Perceived air quality, sick building syndrome (SBS) symptoms and productivity in an office with two different pollution loads. *Indoor air*, *9* (3), 165–179.

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**268**

[1] Gulia S, Nagendra SS, Khare M and

*Environmental Sustainability - Preparing for Tomorrow*

sustainable economic growth. *Sustainable Development.*

[8] Tsai, D. H., Lin, J. S., & Chan, C. C. (2012). Office workers'sick building syndrome and indoor carbon dioxide concentrations. *Journal of occupational and environmental hygiene*, *9*(5), 345–351.

[9] Yau, Y. H., Foo, Y. W., & Mohyi, M. H. H. (2008). A preliminary study on HVAC systems and thermal comfort in a tropical university building in Malaysia. *International Journal of Mechanical and Materials Engineering*, *3*(2), 160–175.

[10] Goel, S., Patidar, R., Baxi, K., & Thakur, R. S. (2017). Investigation of particulate matter performances in relation to chalk selection in classroom

environment. *Indoor and Built Environment*, *26*(1), 119–131.

[11] Majumdar, D., Gajghate, D. G., Pipalatkar, P., & Chalapati Rao, C. V. (2012). Assessment of airborne fine particulate matter and particle size distribution in settled chalk dust during writing and dusting exercises in a classroom. *Indoor and Built Environment*, *21*(4), 541–551.

[12] Khan, S. A. R., Yu, Z., Sharif, A., & Golpîra, H. (2020). Determinants of economic growth and environmental sustainability in South Asian Association for Regional Cooperation: evidence from panel ARDL. *Environmental Science*

[13] Li, N., Georas, S., Alexis, N., Fritz, P., Xia, T., Williams, M. A., ... & Nel, A.

*and Pollution Research*, 1–13.

(2016). A work group report on ultrafine particles (AAAAI) why ambient ultrafine and engineered nanoparticles should receive special attention for possible adverse health outcomes in humans. *The Journal of allergy and clinical immunology*, *138*(2),

386.

management-A review. *Atmos Pollut Res*

*Building and Environment*, *123*, 446–457.

[3] Dorizas, P. V., Assimakopoulos, M. N., Helmis, C., & Santamouris, M. (2015). An integrated evaluation study of the ventilation rate, the exposure and the indoor air quality in naturally ventilated classrooms in the

Mediterranean region during spring. Science of the Total Environment, 502,

[4] Rohra, H., Tiwari, R., Khare, P., & Taneja, A. (2018). Indoor-outdoor association of particulate matter and bounded elemental composition within coarse, quasi-accumulation and quasiultrafine ranges in residential areas of northern India. *Science of The Total Environment*, *631*, 1383–1397.

[5] Srivastava, A., & Jain, V. K. (2003). Relationships between indoor and outdoor air quality in Delhi. *Indoor and Built Environment*, *12*(3), 159–165.

[6] Zhao, J., Birmili, W., Wehner, B., Daniels, A., Weinhold, K., Wang, L., ... & Hussein, T. (2019). Particle Mass Concentrations and Number Size Distributions in 40 Homes in Germany: Indoor-to-outdoor Relationships, Diurnal and Seasonal Variation. *Aerosol and Air Quality Research*, *20*(3), 576–589.

[7] Khan, S. A. R., Zhang, Y., Kumar, A., Zavadskas, E., & Streimikiene, D. (2020). Measuring the impact of renewable energy, public health expenditure, logistics, and environmental performance on

[2] Cheng, Y. H. (2017). Measuring indoor particulate matter concentrations and size distributions at different time periods to identify potential sources in an office building in Taipei City.

Khanna I. Urban air quality

2015;16(2):286–304.

[15] Wyon, D. P. (2004). The effects of indoor air quality on performance and productivity. *Indoor air*, *14*(1), 92–101.

[16] Fisk, W. J. (2000). Health and productivity gains from better indoor environments and their relationship with building energy efficiency. *Annual review of energy and the environment*, *25* (1), 537–566.

[17] Saraga, D., Pateraki, S., Papadopoulos, A., Vasilakos, C., & Maggos, T. (2011). Studying the indoor air quality in three non-residential environments of different use: a museum, a printery industry and an office. *Building and Environment*, *46* (11), 2333–2341.

[18] Razali, N. Y. Y., Latif, M. T., Dominick, D., Mohamad, N., Sulaiman, F. R., & Srithawirat, T. (2015). Concentration of particulate matter, CO and CO2 in selected schools in Malaysia. *Building and environment*, *87*, 108–116.

[19] Zwoździak, A., Sówka, I., Krupińska, B., Zwoździak, J., & Nych, A. (2013). Infiltration or indoor sources as determinants of the elemental composition of particulate matter inside a school in Wrocław, Poland?. *Building and Environment*, *66*, 173–180.

[20] Taneja, A., Saini, R., & Masih, A. (2008). Indoor air quality of houses located in the urban environment of Agra, India. *Annals of the New York Academy of Sciences*, *1140*(1), 228–245.

[21] Kulshreshtha, P., & Khare, M. (2011). Indoor exploratory analysis of gaseous pollutants and respirable particulate matter at residential homes of Delhi, India. *Atmospheric Pollution Research*, *2*(3), 337–350.

[22] Goyal, R., & Khare, M. (2009). Indoor–outdoor concentrations of RSPM in classroom of a naturally ventilated school building near an urban traffic roadway. *Atmospheric Environment*, *43*(38), 6026–6038.

[23] Chithra, V. S., & Nagendra, S. S. (2012). Indoor air quality investigations in a naturally ventilated school building located close to an urban roadway in Chennai, India. *Building and Environment*, *54*, 159–167.

[24] Datta, A., Suresh, R., Gupta, A., Singh, D., & Kulshrestha, P. (2017). Indoor air quality of non-residential urban buildings in Delhi, India. *International Journal of Sustainable Built Environment*, *6*(2), 412–420.

[25] Gupta, A., Goyal, R., Kulshreshtha, P., & Jain, A. (2020). Environmental Monitoring of PM 2.5 and CO 2 in Indoor Office Spaces of Delhi, India. In *Indoor Environmental Quality* (pp. 67– 76). Springer, Singapore.

[26] Habil, M., & Taneja, A. (2011). Children's exposure to indoor particulate matter in naturally ventilated schools in India. *Indoor and Built Environment*, *20*(4), 430–448.

[27] GRIMM, The Ultimate New Model 11-R Mini Laser Aerosol Spectrometer (Mini-LAS). http://www.envitech-bohe mia.cz/files/008-indoor/grimm/ 01-mini-las/mini-las-en.pdf. Accessed on 9th April 2020.

[28] Tiwary, A., & Williams, I. (2018). *Air pollution: measurement, modelling and mitigation*. CRC Press.

[29] Harrison, R. M. (1999). Measurements of concentrations of air pollutants. In *Air pollution and health* (pp. 63–81). Academic Press.

[30] Massey, D. D., & Taneja, M. (2011). Emission and formation of fine particles from hardcopy devices: the cause of indoor air pollution. *Monitoring, Control and Effects of Air Pollution*, 121–134.

[31] Norhidayah, A., Aui, S. H., Ismail, N., Sukadarin, E. H., & Jalil, M. E. A. (2016). Indoor particle size distribution in office. *ARPN J Eng Appl Sci*, *11*(11), 7161–7165.

[32] Tang, T., Hurraß, J., Gminski, R., & Mersch-Sundermann, V. (2012). Fine a nd ultrafine particles emitted from laser printers as indoor air contaminants in German offices. Environmental Science and Pollution Research, 19(9), 3840-3849.

[33] Goyal, R., & Kumar, P. (2013). Indoor–outdoor concentrations of particulate matter in nine microenvironments of a mix-use commercial building in megacity Delhi. *Air quality, atmosphere & health*, *6*(4), 747–757.

[34] Shi, S., Chen, C., & Zhao, B. (2017). Modifications of exposure to ambient particulate matter: Tackling bias in using ambient concentration as surrogate with particle infiltration factor and ambient exposure factor. Environmental pollution, 220, 337–347.

[35] Kalimeri, K. K., Bartzis, J. G., Sakellaris, I. A., & de Oliveira Fernandes, E. (2019). Investigation of the PM2. 5, NO2 and O3 I/O ratios for office and school microenvironments. Environmental research, 179, 108791.

[36] Sangiorgi, G., Ferrero, L., Ferrini, B. S., Porto, C. L., Perrone, M. G., Zangrando, R., ... & Bolzacchini, E. (2013). Indoor airborne particle sources and semi-volatile partitioning effect of outdoor fine PM in offices. Atmospheric environment, 65, 205–214.

[37] Deng, L., & Deng, Q. (2018). The basic roles of indoor plants in human

health and comfort. *Environmental Science and Pollution Research*, *25*(36), 36087–36101.

[38] Moya, T. A., van den Dobbelsteen, A., Ottele, M., & Bluyssen, P. M. (2019). A review of green systems within the indoor environment. *Indoor and Built Environment*, *28*(3), 298–309.

[39] Kobayashi, K. D., Kaufman, A. J., Griffis, J., & McConnell, J. (2007). Using houseplants to clean indoor air.

[40] Gawrońska, H., & Bakera, B. (2015). Phytoremediation of particulate matter from indoor air by *Chlorophytum comosum* L. plants. *Air Quality, Atmosphere & Health*, *8*(3), 265–272.

[41] Torpy, F., & Zavattaro, M. (2018). Bench-study of green-wall plants for indoor air pollution reduction. J. Living Archit, 5(1), 1–15.

**271**

**Chapter 15**

**Abstract**

quality effluents.

**1. Introduction**

agents, industrial wastes, promised techniques

well studied in last few decades [4].

Correlation between Air Quality

Recently, air pollution is a universal problematic concern which adversely affects global warming and more importantly human body systems. This chapter focuses on the importance of air quality, and indicates the negative effects of emissions originated from both municipal and industrial wastewaters to atmosphere. More importantly, the improvements in wastewater treatment plants to eliminate the crisis of emissions on environment and human health is also clarified. Urbanization

and distribution of industrials in urban areas influence the air pollution via releasing pollutants and contaminants to environment. The pollutant emissions from wastewaters are volatile organic compounds, Greenhouse gases and other inorganic pollutants (heavy metals) which are causes to many reactions through atmosphere, then products detriment whole environment and living organisms including human. Moreover, contaminants are also released into air from influents of municipal wastewaters and they are considered as the main resources of most threatened infections in human and other animals. As conclusion, because of the persistently development urbanization and industrialization as the wastewater pollutant sources, the environmental technology regarding wastewater treatments must depend on prevention of emissions to air before thinking on cost and good

**Keywords:** air pollution, municipal wastewater, pollutant emission, infectious

Health effects due to air pollution are a big concern for the World Health Organization. Air pollution does not only cause toxicological effects on human health, it has also significantly degraded the environment in the last years [5, 6]. Now a day, wastewater treatment plants (WWTPs) are definitely known as one of the most crises on air quality and availability of gases, chemical pollutants and biological contaminants in environment directly resourced from sewage wastewaters [7].

The world recognizes air pollution as detrimental issue that significantly affects public health. There has been intensive studies and documentation of the effects of air pollution around the world [1, 2]. Sustainable development in any society provides a good living standard for the individuals. Also, these include social progress and equality, environmental protection, conservation of natural resources, and stable economic growth [3]. Industrial and transportation emissions and their burden in regional and global harm on health, climate and vegetation have been

and Wastewater Pollution

*Karzan Mohammed Khalid*

## **Chapter 15**

[30] Massey, D. D., & Taneja, M. (2011). Emission and formation of fine particles from hardcopy devices: the cause of indoor air pollution. *Monitoring, Control and Effects of Air Pollution*, 121–134.

*Environmental Sustainability - Preparing for Tomorrow*

health and comfort. *Environmental Science and Pollution Research*, *25*(36),

[38] Moya, T. A., van den Dobbelsteen, A., Ottele, M., & Bluyssen, P. M. (2019). A review of green systems within the indoor environment. *Indoor and Built*

[39] Kobayashi, K. D., Kaufman, A. J., Griffis, J., & McConnell, J. (2007). Using houseplants to clean indoor air.

[40] Gawrońska, H., & Bakera, B. (2015). Phytoremediation of particulate matter from indoor air by *Chlorophytum*

*comosum* L. plants. *Air Quality, Atmosphere & Health*, *8*(3), 265–272.

Archit, 5(1), 1–15.

[41] Torpy, F., & Zavattaro, M. (2018). Bench-study of green-wall plants for indoor air pollution reduction. J. Living

*Environment*, *28*(3), 298–309.

36087–36101.

[31] Norhidayah, A., Aui, S. H., Ismail, N., Sukadarin, E. H., & Jalil, M. E. A. (2016). Indoor particle size distribution in office. *ARPN J Eng Appl Sci*, *11*(11),

[32] Tang, T., Hurraß, J., Gminski, R., & Mersch-Sundermann, V. (2012). Fine a nd ultrafine particles emitted from laser printers as indoor air contaminants in German offices. Environmental Science

and Pollution Research, 19(9),

particulate matter in nine microenvironments of a mix-use commercial building in megacity Delhi. *Air quality, atmosphere & health*, *6*(4),

[33] Goyal, R., & Kumar, P. (2013). Indoor–outdoor concentrations of

[34] Shi, S., Chen, C., & Zhao, B. (2017). Modifications of exposure to ambient particulate matter: Tackling bias in using ambient concentration as surrogate with particle infiltration factor and ambient exposure factor. Environmental pollution, 220, 337–347.

[35] Kalimeri, K. K., Bartzis, J. G., Sakellaris, I. A., & de Oliveira

Fernandes, E. (2019). Investigation of the PM2. 5, NO2 and O3 I/O ratios for office and school microenvironments. Environmental research, 179, 108791.

[36] Sangiorgi, G., Ferrero, L., Ferrini, B.

[37] Deng, L., & Deng, Q. (2018). The basic roles of indoor plants in human

S., Porto, C. L., Perrone, M. G., Zangrando, R., ... & Bolzacchini, E. (2013). Indoor airborne particle sources and semi-volatile partitioning effect of outdoor fine PM in offices. Atmospheric

environment, 65, 205–214.

**270**

7161–7165.

3840-3849.

747–757.
