U.S. EPA fact sheet. [PDF format]

National Safety Council's Environmental Health Center (EHC) conducts a variety of outreach and education activities on air quality issues. Topics include indoor air quality, mobile emissions, and radon.

Recounts the historical development of United States air quality statutes and regulations, including an introduction to the technical concepts involved.

A free resource for Virginia Vehicle Emissions Inspectors. Includes on-line training, discussions forum, tutorials, and a cartoon archive. Citizens who have failed the emissions inspection can use this site for information on causes and repairs that could lead to a passing emissions result.

Various materials on air quality and visibility, Forest Service Class I PSD Areas, Integrating Air Quality and Fire Management into Land Management Planning, and smoke and dust from wildland fires.

Air pollution data, ozone forecasting, information about public health and environmental effects of air pollution, and actions you can take to reduce pollution.

The BAAQMD (District) is the regional, government agency that regulates sources of air pollution within the nine San Francisco Bay Area Counties.

CA air regulations, CA Almanac of Emissions and Air Quality, air emissions modeling, the gasoline additive MTBE, information on reducing air pollution from marine engines, and management of smoke from agricultural burning.

Information about releases of pollutants into air, water and land. From Environment Canada.

Includes global, five day forecasts of dust, smoke and sulfate aerosols as well as comparison with satellite analyses.