The AP 42 Compilation of Air Pollutant Emission Factors, was first published by the US Public Health Service in 1968. In 1972, it was revised and issued as the second edition by the US Environmental Protection Agency (EPA). In 1985, the subsequent fourth edition was split into two volumes. Volume I includes stationary point and area source emission factors, and Volume II includes mobile source emission factors. Volume I is currently in its fifth edition and is available on the Internet. Volume II is no longer maintained as such, but roadway air dispersion models for estimating emissions from onroad vehicles and from non-road vehicles and mobile equipment are also available on the Internet.
In routine common usage, Volume I of the emission factor compilation is very often referred to as simply AP 42.
Read more about AP 42 Compilation Of Air Pollutant Emission Factors: Introduction, Chapters in AP 42, Volume I, Fifth Edition, Other Sources of Emission Factors
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