Air Emissions Factors and Quantification

  • What is an emission factor?

    An emissions factor is a representative value that attempts to relate the quantity of a pollutant emitted with an industrial activity.

Emissions factors are tools for building emissions inventories, guiding air quality management decisions and developing emissions control strategies.  

Alerts

10/18/2024 - EPA has drafted new/revised emission factors for AP-42 Chapter 11, Section 7 – Ceramic Products Manufacturing. These factors can be found on the Draft Revisions to AP-42 Chapter 11, Section 7 – Ceramic Products Manufacturing page. Comments will be accepted through December 17, 2024.

10/10/2024 - EPA has finalized AP-42 Chapter 7, Section 1 – Organic Liquid Storage Tanks. The response to comments, a summary of changes made, and the final AP-42 section can be found on the  Final Revisions to AP-42 Chapter 7, Section 1 – Organic Liquid Storage Tanks page.

10/9/2024 -  EPA released TANKS 5.1 - an updated/final version of the TANKS 5.0 Beta application. This updated version includes improved and additional features, as well as bug fixes. To receive notifications related to application updates, sign up for the CHIEF Listserv by sending an e-mail to join-chief@lists.epa.gov. 

Air Emissions Factors / AP-42

Web Factor and Information Retrieval System (WebFIRE)

See also Clearinghouse for Inventories and Emissions Factors (CHIEF)

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Last updated on October 18, 2024