AP-42: Compilation of Air Emissions Factors from Stationary Sources

Compilation of Air Pollutant Emissions Factors from Stationary Sources (AP-42)

AP-42, Compilation of Air Pollutant Emissions Factors from Stationary Sources, has been published since 1972 as the primary compilation of EPA's emissions factor information. It contains emissions factors and process information for more than 200 air pollution source categories. A source category is a specific industry sector or group of similar emitting sources. The emissions factors have been developed and compiled from source test data, material balance studies, and engineering estimates. The latest emissions factors are available below on this website. Use the AP-42 Chapter webpage links below to access the document by chapter. Emission factors are being updated as data are received and evaluated. The most recent update is Chapter 7, Section 1 - Organic Liquid Storage Tanks (10/2024).

AP-42, Compilation of Air Pollutant Emissions Factors from Stationary Sources

Chapter	Title
Table of Contents	AP-42 Table of Contents (pdf) (245.41 KB)
Introduction	AP-42 Introduction (pdf) (288.31 KB)
Chapter 1	External Combustion Sources
Chapter 2	Solid Waste Disposal
Chapter 3	Stationary Internal Combustion Sources
Chapter 4	Evaporation Loss Sources
Chapter 5	Petroleum Industry
Chapter 6	Organic Chemical Process Industry
Chapter 7	Liquid Storage Tanks
Chapter 8	Inorganic Chemical Industry
Chapter 9	Food and Agricultural Industries
Chapter 10	Wood Products Industry
Chapter 11	Mineral Products Industry
Chapter 12	Metallurgical Industry
Chapter 13	Miscellaneous Sources
Chapter 14	Greenhouse Gas Biogenic Sources
Chapter 15	Ordnance Detonation
Appendix A	Miscellaneous Data and Conversion Factors -- September 1985 (32 pp, 103 K, About PDF)
Appendix B.1	Particle Size Distribution Data and Sized Emission Factors for Selected Sources -- October 1986(103 pp, 2 M, About PDF)
Appendix B.2	Generalized Particle Size Distributions -- September 1996(103 pp, 137 K, About PDF)
Appendix C.1	Procedures for Sampling Surface/Bulk Dust Loading -- July 1993(13 pp, 65 K, About PDF)
Appendix C.2	Procedures for Laboratory Analysis of Surface/Bulk Dust Loading Samples -- July 1993(9 pp, 42 K, About PDF)
Chapter References	AP-42 Chapter References