Wyoming Department of Environmental Quality

01/09/2025 | News release | Distributed by Public on 01/09/2025 16:55

Notice of Final Adoption for R-37 Rulemaking

  • Chapter 2, Ambient Standards, Section 2, Ambient Standards for Particulate Matter, has been updated to reflect the newly promulgated PM2.5 National Ambient Air Quality Standards (NAAQS). Section 12, Incorporation by Reference, has been updated to incorporate by reference from the Code of Federal Regulations (CFR). The revisions to Sections 2 and 12 involve changes to the State Implementation Plan (SIP).

  • Chapter 3, General Emission Standards, Section 9, Incorporation by Reference, has been updated to incorporate by reference from the CFR as of July 1, 2024. There is one additional, non-substantive revision in Chapter 3, Section 8 pertaining to a typographical revision. The revisions to Section 9 involve changes to the SIP.

  • Chapter 4, State Performance Standards for Specific Existing Sources, Section 6, Incorporation by Reference, has been updated to incorporate by reference from the CFR as of July 1, 2024.

  • Chapter 5, National Emission Standards, Section 2, New Source Performance Standards, has been updated to incorporate 40 CFR Part 60, subpart UU, which pertains to standards of performance for asphalt processing and asphalt roofing manufacture and storage, and 40 CFR Part 60, subpart OOOOb, which pertains to standards of performance for crude oil and natural gas facilities that commenced construction, modification, or reconstruction after December 6, 2022. Section 4, Incorporation by Reference, has been updated to incorporate by reference from the CFR as of July 1, 2024.

  • Chapter 6, Permitting Requirements, Section 3, Operating permits, has been updated to remove the Title V Affirmative Defense provisions from subsection (1) per a U.S. Court of Appeals for the D.C. Circuit ruling. The provisions in subsection (1) have been replaced with [Reserved]. Section 4, Prevention of significant deterioration, has been updated to remove the PM2.5 Significant Impact Levels from subsection (b)(i)(A)(I)(1.). Section 14, Incorporation by reference, has been updated to incorporate by reference from the CFR as of July 1, 2024. The revisions to Sections 4 and 14 involve changes to the SIP.

  • Chapter 8, Nonattainment Area Regulations, Section 10, Incorporation by Reference, has been updated to incorporate by reference from the CFR as of July 1, 2024. The revisions to Section 10 involve changes to the SIP.

  • Chapter 11, National Acid Rain Program, Section 2, Acid Rain Program, has been updated to incorporate by reference from the CFR as of July 1, 2024.

  • Chapter 14, Emission Trading Program Regulations, Section 5, Incorporation by Reference, has been updated to adopt by reference from the CFR as of July 1, 2024. There is one additional, non-substantive revision in Chapter 14, Section 5, pertaining to a formatting revision.

If you have questions concerning this rule adoption, please feel free to contact Michael Morris at 307-777-2068. Once again, current Wyoming Air Quality Standards and Regulations are available electronically at https://rules.wyo.gov/Default.aspx.