In the United States, the Clean Air Act sets national ambient air quality standards for six common air pollutants: particle pollution (also known as particulate matter), ground-level ozone (O3), carbon monoxide (CO), sulfur oxides (SOx), nitrogen oxides (NOx), and lead (Pb). Read about each of these, their common sources, and the Air Quality Index (AQI) at this Environmental Protection Agency (EPA) site: Six Common Air Pollutants. Expand your understanding of the health effects of the different types of air pollutants, specifically the issues associated with indoor air pollution, by reading Section IV of the Encyclopedia of Energy. Compare the differences in indoor air pollution and how it differs between industrialized and developing nations.
