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Federal
Air Quality System (AQS)
U.S. Environmental Protection Agency —
The Air Quality System (AQS) database contains measurements of air pollutant concentrations from throughout the United States and its territories. The measurements... -
Federal
AP-42 Emissions Factors (WebFIRE)
U.S. Environmental Protection Agency —
Emissions factors have long been the fundamental tool in developing national, regional, state, and local emissions inventories for air quality management decisions... -
Federal
OAR Tribal System
U.S. Environmental Protection Agency —
OTS is an internal EPA national tribal database to assist the Regions and HQs in tracking tribal performance information. -
Federal
Air Trends
U.S. Environmental Protection Agency —
Air Trends provides geographic trend information for specific air pollutants.