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AP-42 Emissions Factors (WebFIRE)

Published by U.S. EPA Office of Air and Radiation (OAR) - Office of State Air Partnerships (OSAP) | U.S. Environmental Protection Agency | Catalog Last Checked: July 09, 2026 at 12:46 PM | Dataset Last Updated: January 01, 2014
AP-42: Compilation of Air Pollutant Emissions Factors from stationary sources is EPA's primary compilation of emission factors for stationary sources. AP-42 contains emission factors, emission factor references and process information for more than 200 air pollution source categories.

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