Public Comment Form

Wyoming Air Quality Standards and Regulations (WAQSR) R-37 Proposed Rulemaking

The Wyoming Department of Environmental Quality, Air Quality Division is proposing changes to the Wyoming Air Quality Standards and Regulations (WAQSR). The following chapter will propose to have the Incorporation by Reference (IBR) dates updated to July 1, 2024:

·        Chapter 2, Ambient Standards

·        Chapter 3, General Emissions Standards

·        Chapter 4, State Performance Standards for Specific Existing Sources

·        Chapter 5, National Emission Standards

·        Chapter 6, Permitting Requirements

·        Chapter 8, Nonattainment Area Regulations

·        Chapter 11, National Acid Rain Program

·        Chapter 14, Emission Trading Program Regulations


Additional changes are proposed for the following chapter sections:

·        Revising Chapter 2, Section 2, Ambient Standards for Particulate Matter, to update the PM2.5 primary annual standard in so that it reflects the new 2024 PM2.5 National Ambient Air Quality Standards (NAAQS).

·        Revising Chapter 5, Section 2, New Source Performance Standards, to add 40 CFR Part 60, subpart UU (Standards for Performance for Asphalt Processing and Asphalt Roofing Manufacture) and 40 CFR Part 60, subpart OOOOb, Standards of Performance for Crude Oil and Natural Gas Facilities for Which Construction Modification or Reconstruction Commenced After December 6, 2022.

·        Revising Chapter 6, Section 3, Operating permits, to remove Title V Affirmative Defense provisions from subsection (l) per a U.S. Court of Appeals for the D.C. Circuit ruling.

·        Revising Chapter 6, Section 4, Prevention of significant deterioration, to remove PM2.5 Significant Impact Levels from subsection (b)(i)(A)(I)(1.).

·        Revising Chapter 6, Section 14, Incorporation by reference, to match the language of other IBR sections in the WAQSR that were updated previously in 2024.

·        Making two minor, non-substantive typographical revisions in Chapter 3 and Chapter 14.


The proposed revisions to Chapter 2, Section 12, Chapter 3, Section 9, Chapter 6, Section 14, and Chapter 8, Section 10 involve changes to the Wyoming State Implementation Plan (SIP). 


To view the proposed revisions, please visit: https://deq.wyoming.gov/aqd/rule-development/proposed-rules-and-regulations/.




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