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  2. Air Monitoring at Agricultural Operations

Draft AP-42 Chapter 9, Section 4 - Livestock and Poultry Feed Operations and Air Emissions Estimating Methodologies for Animal Feeding Operations

Background

Under the 2005 Air Compliance Agreement (the Agreement) with the animal production industry, EPA is responsible for using NAEMS data to develop emission models for emissions of ammonia, hydrogen sulfide, particulate matter, and volatile organic compounds (VOCs) at animal feeding operations raising swine, broiler chickens, egg-laying operations, and dairies. 

 In 2013, EPA’s Science Advisory Board (SAB) reviewed the original draft emission models and made recommendations for improving their development. SAB’s recommendations have been incorporated into the draft  emission models.  

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.

The EPA is extending the public review period to August 18, 2025. Comments should be sent to  the NAEMS Group (NAEMS@epa.gov). 

Draft AP-42 Chapter 9, Section 4 - Livestock and Poultry Feed Operations

Draft AP42 Section 9.4 Livestock and Poultry Feed Operations Nov 2024 (pdf) (546.63 KB)

Fact Sheet Farm Models (pdf) (135.35 KB) , November 2024

Emission Model Reports For Animal Feeding Operations

  • Draft Development of Emissions Estimating Methodologies for Animal Feeding Operations Volume 1 Overview Report Nov 2024 (pdf) (692.23 KB)
  • Draft Volume 1 Overview Report Appendices A and B Nov 2024 (pdf) (769.42 KB)
  • Draft Development of Emissions Estimating Methodologies for Animal Feeding Operations Volume 2 Swine Report (pdf) (4.8 MB)
  • Draft Volume 2 Swine Report Appendices A through G Nov 2024 (pdf) (16.97 MB)
  • Draft Development of Emissions Estimating Methodologies for Animal Feeding Operations Volume 3 Broilers Report (pdf) (1.87 MB)
  • Draft Volume 3 Broiler Report Appendices A through H Nov 2024 (pdf) (21.62 MB)
  • Draft Development of Emissions Estimating Methodologies for Animal Feeding Operations Volume 4 Layers Report Nov 2024 (pdf) (4.01 MB)
  • Draft Volume 4 Layers Report Appendices A through H (pdf) (14.7 MB)
  • Draft Development of Emissions Estimating Methodologies for Animal Feeding Operations Volume 5 Dairy Report Nov 2024 (pdf) (3.3 MB)
  • Draft Volume 5 Dairy Report Appendices A through G Nov 2024 (pdf) (31.73 MB)
  • Draft Development of VOC Emissions Estimating Methodologies for Animal Feeding Operations Nov 2024 (pdf) (1.16 MB)

Emission Data Files For Animal Feeding Operations

  • Swine zip (2.8 MB)
  • Poultry zip (1.6 MB)
  • Dairy zip (4.0 MB)

Air Monitoring at Agricultural Operations

  • AFOS Air Home
    • Conservation Measures for Cropping Systems and Land Management
    • Conservation Measures for Livestock Systems
    • National Air Emissions Monitoring Study
    • Draft Air Emissions Estimating Methodologies for Animal Feeding Operations
    • NAEMS Status
    • Emission Standards for Farm Equipment - Boilers
    • Emission Standards for Farm Equipment - Engines
    • EPA USDA Agricultural Air Quality Memorandum of Understanding
    • EPA USDA Agricultural Equipment Statement of Principles
Contact Us about Air Monitoring at Animal Feeding Operations (AFOs)
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on March 13, 2025
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