Data / Federal rules / 2026-12543

Air Plan Approval; Colorado; RACT Requirements for the 2008 8-Hour Ozone Standard for the Denver Metro/North Front Range Nonattainment Area

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

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What the agency says

The U.S. Environmental Protection Agency (EPA) is proposing to approve portions of Colorado State Implementation Plan (SIP) submittals under the Clean Air Act (CAA) that address SIP obligations related to Reasonably Available Control Technology (RACT) requirements for the 2008 ozone National Ambient Air Quality Standards (NAAQS) for the Denver-Boulder-Greeley-Ft. Collins-Loveland, Colorado ozone nonattainment area. The EPA is proposing approval of portions of the RACT SIP submittals that address reporting requirements for certain source categories and reorganize certain state air pollution regulations. The EPA is also proposing to find that the State has addressed the EPA's prior limited disapproval.

Key facts

Document number: 2026-12543
Type: Proposed rule
Action: Proposed rule
Agency: Environmental Protection Agency
Published: June 23, 2026
Comments due: July 23, 2026
Dates: Written comments must be received on or before July 23, 2026.
Docket: EPA-R08-OAR-2024-0225; FRL-13376-01-R8
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Carbon oxides; Environmental protection; Incorporation by reference; Intergovernmental relations; Lead; Nitrogen dioxide; Ozone; Particulate matter; Reporting and recordkeeping requirements; Sulfur oxides; Volatile organic compounds
Pages: 5

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on air pollution control · Rules on carbon oxides · Rules on environmental protection · 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.