Source Reports provide information about the sources of air pollution. The principal information is estimates of annual emissions of each air pollutant. Reports may also include descriptive information such as source names and locations.
Examples are power plants, factories, colleges, and gasoline stations.
EPA has emissions estimates for each individual point source. EPA compiles county aggregate emissions estimates for area sources. Examples are cars, trucks, buses, earth moving equipment, water vessels, railroad locomotives, and airplanes. EPA compiles county aggregate emissions estimates for mobile sources. Criteria air pollutants were defined in the original 1970 Clean Air Act, and EPA has tracked emissions and ambient concentrations of these six pollutants since then.