Air Emissions Factors and Quantification

5/28/25 - EPA has finalized AP-42 Chapter 11, Section 7 – Ceramic Clay Manufacturing. The finalized factors, the comment received, the response to the comment, and the final AP-42 section can be found on the Final Revisions to AP-42 Chapter 11, Section 7 – Ceramic Clay Manufacturing page. 

3/13/25 - EPA has extended the public comment period deadline to August 18, 2025 for AP-42 Chapter 9 Section 4 - Livestock and Poultry Feed Operations and included the associated emission model reports for animal feeding operations and VOC emissions from animal sectors.  Comments should be sent to the NAEMS Group (NAEMS@epa.gov).

11/19/2024 - EPA has drafted a new AP-42 Chapter 9 Section 4 - Livestock and Poultry Feed Operations and included the associated emission model reports for animal feeding operations and VOC emissions from animal sectors for review. This section and these models can be found on the Draft AP-42 Chapter 9, Section 4 - Livestock and Poultry Feed Operations and Air Emissions Estimating Methodologies for Animal Feeding Operations page. The EPA is offering 90-day public review period that will end on February 17, 2025. Comments should be sent to the NAEMS Group (NAEMS@epa.gov).