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Federal
National Emission Inventory
U.S. Environmental Protection Agency —
The National Emission Inventory contains measured, modeled, and estimated data for emissions of all known source categories in the US (stationary sources, fires,... -
Federal
Web page with links to air quality and emissions data
U.S. Environmental Protection Agency —
A web page that describes and links to EPA systems for accessing and downloading ambient (outdoor) air quality and emissions data -
Federal
Web page with Air Quality System (AQS) ambient observation files
U.S. Environmental Protection Agency —
Ambient concentrations of most requested pollutants from the national ambient air quality monitoring networks stored in the Air Quality System (AQS).