**7. Acknowledgement**

Bílek K., Cejpek J., Dropa T., Kollárová D., Kubátová H., Matheisová H., Němeček Vl., Urban M., Večerková J., Vošáhlík J., Weisheitlová M., Witkovská V.

## **8. References**

	- [5] Jankovský M., Lachman J., Staszková L. (1999) Wood Chemistry (in Czech). Czech Univerzity of Life Sciences. Praha, ISBN 80-213-0559-2

**Chapter 18** 

© 2012 Estokova and Stevulova, licensee InTech. This is an open access chapter 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.

© 2012 Estokova and Stevulova, licensee InTech. This is a paper 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.

**Investigation of Suspended and** 

Adriana Estokova and Nadezda Stevulova

Additional information is available at the end of the chapter

size and larger particles with increasing efficiency.

http://dx.doi.org/10.5772/46130

**1. Introduction** 

thousands kilometres.

**Settled Particulate Matter in Indoor Air** 

Particulate matter is a natural part of the atmosphere, where the solid or liquid particles are suspended in the air. These suspended particles, also known as suspended particulate matter represents a dispersion aerosol system. In the air there are many types of microscopic airborne particles originated from both natural and anthropogenic processes, such as atmospheric clouds of water droplets, photochemically generated particles, re-suspended particulates, fumes arising from the production of energy, etc. They are present in various forms, eg. mists, fumes, dust. The atmosphere contains particles of the size ranging from slightly larger than molecules up to hundreds of micrometers, which consists of a variety of chemical compounds [1]. Depending of their lifetime, the particulates observed at a location can be both of local origin or the product of the transport over distances of hundreds to

Particulate matter is mainly classified by particle size distribution as follows [2]: Coarse Particles (CP) include all particles with an aerodynamic diameter (diameter of a sphere with unit density and mass equal to the mass of the provided particle) greater than 2.5 micrometers and less than 10 micrometers. These particles are identified as PM2.5-10. PM10 is an abbreviation used for so called "thoracic" particles with the diameter under 10 μm. Fine Particles (FP) include all particles having an aerodynamic diameter less than 2.5 micrometers and greater than 0.1 micrometers (PM2.5). Ultrafine Particles (UFP) include all particles the aerodynamic diameter of which is less than 0.1 micrometers. These size limits are not sharp; the cyclone and impactor pre-separators remove half of the particles at the cut

Increase in particulate matter air contamination and its negative impact on human health have resulted in efforts to monitor and identify the pollutants. The particulate mass concentrations in a very clean urban environment are about 10 g.m-3, which correspond to

