Data / Federal rules / 2026-11436

Approval and Promulgation of Air Quality Implementation Plans; Wyoming; Regional Haze Federal Implementation Plan

The Environmental Protection Agency published this proposed rule in the Federal Register on June 8, 2026. Comments closed on July 23, 2026.

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What the agency says

The U.S. Environmental Protection Agency (EPA) is proposing revisions to the Federal Implementation Plan (FIP) addressing regional haze in the State of Wyoming. The EPA is proposing revisions to the FIP's nitrogen oxides (NO<INF>X</INF>) best available retrofit technology (BART) requirements for the PacifiCorp Dave Johnston Power Plant Unit 3. In response to PacifiCorp's letter no longer consenting to closure of Dave Johnston Unit 3, the EPA is proposing to withdraw the NO<INF>X</INF> BART determination containing the closure requirement. Additionally, in response to a request from PacifiCorp, and in light of new information that was not available at the time the EPA originally promulgated the FIP in 2014, the Agency is also proposing to revise the other NO<INF>X</INF> BART determination for Dave Johnston Unit 3.

Key facts

Document number: 2026-11436
Type: Proposed rule
Action: Proposed rule
Agency: Environmental Protection Agency
Published: June 8, 2026
Comments due: July 23, 2026
Dates: Comments: Written comments must be received on or before July 23, 2026 unless a public hearing is held. If a public hearing is held, comments on this notice of proposed rulemaking must be received on or before date 30 days after date of public hearing.
Docket: EPA-R08-OAR-2026-1651; FRL-13299-01-R8
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Ammonia; Carbon oxides; Environmental protection; Incorporation by reference; Intergovernmental relations; Lead; Nitrogen oxides; Ozone; Particulate matter; Reporting and recordkeeping requirements; Sulfur oxides; Volatile organic compounds
Pages: 9

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on air pollution control · Rules on ammonia · Rules on carbon oxides · Published in June 2026

Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.