AP-42: Compilation of Air Emissions Factors
On This Page:
- Compilation of Air Pollutant Emissions Factors (AP-42)
- Additional AP-42 Resources
Compilation of Air Pollutant Emissions Factors (AP-42)
AP-42, Compilation of Air Pollutant Emissions Factors, 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 Fifth Edition of AP-42 was published in January 1995. Since then EPA has published supplements and updates to the fifteen chapters available in Volume I, Stationary Point and Area Sources. The latest emissions factors are available below on this website. Use the AP-42 Chapter webpage links below to access the document by chapter.
Proposed/Revised/New Emissions Factors
Documentation Supporting Proposed and New Emissions Factors
AP-42 Proposed Emissions Factors, But Not Finalized
After the comment period, can I use a draft section?(701 B) (1 p, 1 K)
| Chapter & Section | Description | Comments Requested by: |
|---|---|---|
| Section 2.4 | Municipal Solid Waste Landfills | May 5, 2009 |
| Section 4.12 | Manufacture of Rubber Products | February 2, 2009 |
| Chapter 15 | Ordnance Detonation | December 7, 2009 |
AP-42, Fifth Edition Compilation of Air Pollutant Emissions Factors, Volume 1: Stationary Point and Area Sources
Historical AP-42 Information
Proposed and final rules related to emissions factors
October 14, 2009 - The Emissions Factors Program Improvements - Advanced notice of proposed rulemaking is available on the www.regulations.gov website. The comment period ended December 14, 2009.
AP-42 FAQs
Answers to frequent questions about AP-42.
There are currently no drafts sections under review.
AP-42 listing of supplements and updates.
Supplements A through F (1996 - 2000)(PDF)(3 pp, 148 K, About PDF)
Updates 2001 to 2011 (PDF)(2 pp, 241 K, About PDF)
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 above.