Emissions Factors & AP 42
An emissions factor is a representative value that attempts to relate the quantity of a pollutant released to the atmosphere with an activity associated with the release of that pollutant. These factors are usually expressed as the weight of pollutant divided by a unit weight, volume, distance, or duration of the activity emitting the pollutant (e.g., kilograms of particulate emitted per megagram of coal burned). Such factors facilitate estimation of emissions from various sources of air pollution. In most cases, these factors are simply averages of all available data of acceptable quality, and are generally assumed to be representative of long-term averages for all facilities in the source category (i.e., a population average). |
The general equation for emissions estimation is:
E = A x EF x (1-ER/100) where:
For information about emissions factors from highway vehicles and nonroad mobile sources, visit the Office of Transportation and Air Quality web site. |
AP 42, Fifth Edition Compilation of Air Pollutant Emission Factors, Volume 1: Stationary Point and Area Sources |
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For current information on AP 42 updates and the activities of the Measurement Policy Group, you can subscribe to the CHIEF Listserv. | ||
AP 42 FAQs | Answers to frequently asked questions about AP 42 | |
Drafts | Draft Sections Under Review | |
AP 42 listing of supplements and updates. | Supplements A through F (1996 - 2000) Updates 2001 to present |
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Older Editions of AP-42, Volume 1 | This information is available for historical purposes only. For the most recent emissions factors, supported by the EPA, please see the table of contents below. | |
Procedures |
Procedures for Preparing Emission Factor Documents -- Describes
procedures for developing and reporting emission factors in EPA publications
-- November 1997 (PDF 477K) Addendum to Procedures for Preparing Emission Factor Documents. August 2008 (PDF 21K) The draft version of the document, Detailed Procedures For Preparing Emissions Factors, has been removed and is being redeveloped. August 2008. |
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Contents | Cover page, detailed Table of Contents, Publications in Series, Insertion Instructions, and Key Word Index (PDF 128K). This is current through Fifth Edition, Supplement C of AP 42. For sections and chapters added after November 1997, see the chapter web pages below. | |
AP 42, Volume I, Fifth Edition | ||
Introduction | Introduction to AP 42, Volume I, Fifth Edition - January 1995 (PDF 40K) | |
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 & Conversion Factors -- September 1985 (PDF 103K) | |
Appendix B.1 | Particle Size Distribution Data and Sized Emission Factors for Selected Sources -- October 1986 (PDF 2M) | |
Appendix B.2 | Generalized Particle Size Distributions -- September 1996 (PDF 137K) | |
Appendix C.1 | Procedures for Sampling Surface/Bulk Dust Loading -- July 1993 (PDF 65K) | |
Appendix C.2 | Procedures for Laboratory Analysis of Surface/Bulk Dust Loading Samples -- July 1993 (PDF 42K) |
Draft Sections Under Review | ||
After the comment period, can I use a draft section? (TXT 1K) | ||
Chapter & Section | Description | Comments Requested by: |
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Section 12.5.1 | Steel Minimills | December 4, 2008 |