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Air Emissions Factors and Quantification

Older Editions of AP 42, Compilation of Air Pollutant Emission Factors

The AP 42, Compilation of Air Pollutant Emission Factors, was first published by the US Public Health Service in 1968. The first through fourth editions, including supplements, are available below. In September 1985, the 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 II is available on the the EPA's Office of Transportation & Air Quality web site.

This information is available for historical purposes only. For the most recent emission factors, supported by the EPA, please go to the current AP 42 web site.

The files are scanned images and have been converted to Acrobat PDF.

Note: EPA no longer updates this information, but it may be useful as a reference or resource.

First editions, AP 42, US EPA
Compilation of Air Pollutant Emission Factors, 1968 (PDF 2M)
Environmental Health Series, US Public Health Service
Compilation of Air Pollutant Emission Factors,
1971 (PDF 8M) Preliminary Document, US EPA
Compilation of Air Pollutant Emission Factors,
1972 (PDF 8M) Revised, US EPA
Second edition, AP 42, US EPA
Compilation of Air Pollutant Emission Factors - Second edition,
1973 (PDF 11M)
Compilation of Air Pollutant Emission Factors - Second edition, supplement 1,
July 1973 (PDF 1.3M)
Compilation of Air Pollutant Emission Factors - Second edition, supplement 2 ,
September 1973 (PDF 850K)
Compilation of Air Pollutant Emission Factors - Second edition, supplement 3,
May 1974 (PDF 3M)
Compilation of Air Pollutant Emission Factors - Second edition, supplement 4,
January 1975 (PDF 3.5M)
Compilation of Air Pollutant Emission Factors - Second edition with supplements 1-4, 1975 (PDF 17M)
Compilation of Air Pollutant Emission Factors - Second edition, supplement 5,
December 1975 (PDF 8.5M)
Compilation of Air Pollutant Emission Factors - Second edition, supplement 6,
April 1976 (PDF 3M)
Compilation of Air Pollutant Emission Factors - Second edition, supplement 7,
April 1977 (PDF 5.7M)
Third edition, AP 42, US EPA
Compilation of Air Pollutant Emission Factors - Third edition including supplements 1- 7 from second edition,
1977 (PDF 26M)
Compilation of Air Pollutant Emission Factors - Third edition, supplement 8,
1978 (PDF 6M)
Compilation of Air Pollutant Emission Factors - Third edition, supplement 9,
1979 (PDF 5M)
Compilation of Air Pollutant Emission Factors - Third edition, supplement 10,
February 1980 (PDF 5.5M)
Compilation of Air Pollutant Emission Factors - Third edition, supplement 11,
October 1980 (PDF 4.5M)
Compilation of Air Pollutant Emission Factors - Third edition, supplement 12,
1981 (PDF 5M)
Compilation of Air Pollutant Emission Factors - Third edition, supplement 13,
1982 (PDF 4M)
Compilation of Air Pollutant Emission Factors - Third edition, supplement 14,
1983 (PDF 8M)
Compilation of Air Pollutant Emission Factors - Third edition, supplement 15,
1984 (PDF 3M)
Compilation of Air Pollutant Emission Factors - Third edition, Update package,
1985 (PDF 5M)
Fourth edition, Volume I: Stationary Point and Area Sources, AP 42, US EPA
Compilation of Air Pollutant Emission Factors, - Fourth Edition,
1985 (PDF 27M)
Compilation of Air Pollutant Emission Factors - Fourth Edition, supplement A,
1986 (PDF 13M)
Compilation of Air Pollutant Emission Factors - Fourth Edition, supplement B,
1988 (PDF 6M)
Compilation of Air Pollutant Emission Factors - Fourth Edition, supplement C,
1990 (PDF 5M)
Compilation of Air Pollutant Emission Factors - Fourth Edition, supplement D,
1991 (PDF 5M)
Compilation of Air Pollutant Emission Factors - Fourth Edition, supplement E,
1992 (PDF 8M)
Compilation of Air Pollutant Emission Factors - Fourth Edition, supplement F,
1993 (PDF 22M)
Compilation of Air Pollutant Emission Factors - Fourth Edition, with supplements A through F incorporated,
(1985 to 1993) (PDF 58M)
Fifth edition, Volume I: Stationary Point and Area Sources, AP 42, US EPA
*Most sections in the 5th edition have been updated. The most recent supplements are available on the the AP42 webpage.
Compilation of Air Pollutant Emission Factors, - Fifth Edition,
1995 (PDF 94M)

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