How Outdoor Air Pollution Affects the Quality of Indoor Air Essay

1705 Words 7 Pages
Introduction
We spend most of our time indoors, at work, home and school or even at the shopping mall. There are many sources of air indoor pollution, building materials, cigarettes, consumer products, gas appliances, and furniture can all add to the problem. However, the toxic emissions from many of these contributors are not measured or are only partially measured by local, state or federal laws. Pollution from power plants, cars, and other transportation is a well-known source of outdoor air pollution, but sometimes our indoor air quality is worse; it can be up to ten times worse for you than the outside air. The revised United States Environmental Protection Agency National Ambient Air Quality Standards (US EPA NAAQS) for Particulate
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If we suppose there is no indoor source of pollution, the entering air would be filtrated by whatever it passes through. Yet, we are still uncertain whether this process efficiently removes any pollutant, not to mention the fact that it could actually add other pollutants into the airstream.
In addition, due to the considerable difference in the environment between indoors and outdoors, this could bring much different pollution environment and dispersion characteristics in the two settings. For instance, in a rainy or humid day, outdoor pollutants tend to be washed out while, because of the relative constant humidity indoor, indoor air quality could be much worse, without even looking at any indoor activity.
Moreover, indoor–outdoor relationships are a complex collaboration of various factors like pollutant depletions, meteorological factors, indoor sources and sinks, combustion gases from fireplaces, filtrations and ventilations, etc. The air pollutants indoors and outdoors differ in characteristics, types, absorptions and sources. For example, smoking and cooking have been acknowledged as major sources of indoor pollutants, which are really unimportant outdoors. Therefore, supposing that indoor air is cleaner because of its apparent shielding from outdoors is both unreasonable and injudicious. It is important to determine how outdoor air quality can affect indoor air quality. With all the

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