**9. Meteorological conditions of houses in relation to respiratory conditions**

Meteorological conditions refer to the prevailing environmental conditions as they influence the prediction of weather. A case-control study carried out among children under the age of 5 years with and without ARI in Ibadan revealed that a higher proportion of houses visited recorded a relative humidity (RH) value above the comfort level (30–60%) (**Table 5**) [17]. This high RH (above comfort level) observed among a large proportion of houses among cases could be as a result of high moisture content. With such high relative humidity levels, microorganisms such as fungi and bacteria can survive on non-living materials including dusts [38]. High relative humidity above 70% also tends to favour the survival of viruses that infect the membrane of the respiratory tract.


**Table 5.** Relationship between meteorological condition of the indoor environment and ARI.
