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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
Criteria Air Emissions Trends
U.S. Environmental Protection Agency —
The Air Emissions Trends site provides national trends of criteria pollutant and precursor emissions data based on the the National Emissions Inventory (NEI) from...