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  2. Air Emissions Factors and Quantification

Final Emissions Factors for AP-42 Chapter 2, Section 4 - Municipal Solid Waste Landfills

Background 

EPA's emission factor development team reviews and, if necessary, revises emissions factors for WebFIRE and AP-42. As part of this effort, EPA drafted new emissions factors for AP-42 Chapter 2, Section 4 - Municipal Solid Waste Landfills on January 12, 2024. The EPA offered a 60-day public review period that ended on March 12, 2024. 

Emission Factor Summary List

The final emissions factors for AP-42 Chapter 2, Section 4 can be found in the following spreadsheet:

AP-42 Chapter 2, Section 4 Final Emissions Factors and Tables (xlsx) (36.52 KB)

AP-42 Chapter 2, Section 4 - Municipal Solid Waste Landfills

Final AP-42 Chapter 2, Section 4 - Municipal Solid Waste Landfills (pdf) (679.18 KB)

AP-42 Chapter 2, Section 4 Summary of Changes from Draft to Final (pdf) (227.17 KB)

Draft AP-42 Chapter 2, Section 4 - Municipal Solid Waste Landfills (pdf) (673.2 KB)

AP42 Chapter 2, Section 4 - Final to Final RLSO (pdf) (949.25 KB)

Draft AP-42 Chapter 2, Section 4 – Municipal Solid Waste Landfills Comments  

The EPA received four comments, which are provided below:

Commenter  Commenter Reference Comments
The Environmental Integrity Project (EIP), Sierra Club, and the Chesapeake Climate Action Network EIP

EIP Comments (pdf) (380.89 KB)

EIP Combined Attachments (pdf) (1.19 MB)

EIP Attachment B (xlsx) (3.42 MB)

EIP Attachment C (xlsx) (18.3 KB)

The National Waste & Recycling Association (NWRA) and the Solid Waste Association of North America (SWANA) NWRA/SWANA  NWRA/SWANA Comments (pdf) (270.87 KB)
John Zink Company LLC Zink

Zink Comments (pdf) (239.8 KB)

Zink Comments Attachment (pdf) (741.14 KB)

APTIM/LFG Specialties, LLC APTIM APTIM Comments (pdf) (291.21 KB)

Draft AP-42 Chapter 2, Section 4 – Municipal Solid Waste Landfills Response to Comments 

The EPA's Response to Comments can be found here:

AP-42 Chapter 2, Section 4 EPA Response to Comments (pdf) (469.29 KB)

Reviewed but not Revised Emission Factors 

In response to comments received, EPA has reviewed but not revised 4 emission factors for AP-42 Chapter 2, Section 4 - Municipal Solid Waste Landfills. These emission factors are provided with an explanation of why they were not revised in the spreadsheet below:

AP-42 Chapter 2, Section 4 Reviewed but Not Revised Emission Factors (xlsx) (16.77 KB)

Air Emissions Factors and Quantification

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Last updated on May 28, 2025
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