An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Air Emissions Factors and Quantification

AP 42, Fifth Edition, Volume I Chapter 1: External Combustion Sources

1.0 Introduction to External Combustion Sources (PDF) (10 pp, 72 K, About PDF)
 
1.1 Bituminous and Subbituminous Coal Combustion

 1.2 Anthracite Coal Combustion

 1.3 Fuel Oil Combustion

 1.4 Natural Gas Combustion

 1.5 Liquified Petroleum Gas Combustion

 1.6 Wood Residue Combustion in Boilers

 1.7 Lignite Combustion

 1.8 Bagasse Combustion in Sugar Mills

 
1.9 Residential Fireplaces

 1.10 Residential Wood Stoves

1.11 Waste Oil Combustion

Frequent Questions

Back to AP-42 Emissions Factors by Chapter