Data / Federal rules / 2025-00220

Revisions to the Federal Implementation Plan for the Billings/Laurel, Montana, Sulfur Dioxide Area

The Environmental Protection Agency published this final rule in the Federal Register on January 17, 2025. It took effect on February 18, 2025.

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What the agency says

The Environmental Protection Agency (EPA) is revising a Federal Implementation Plan (FIP) applicable to sulfur dioxide (SO<INF>2</INF>) emissions from four sources located in Billings and Laurel, Montana. Specifically, the EPA is revising a portion of the FIP promulgated by the EPA in 2008 (2008 Billings/Laurel SO<INF>2</INF> FIP) by removing a provision which contained an affirmative defense for exceedances of flare emission limits during malfunctions, startups, and shutdowns. The EPA is taking this action pursuant to the Clean Air Act (CAA).

Key facts

Document number: 2025-00220
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: January 17, 2025
Takes effect: February 18, 2025
Dates: This rule is effective on February 18, 2025.
Docket: EPA-R08-OAR-2023-0587; FRL-11571-02-R8
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Carbon monoxide; Environmental protection; Greenhouse gases; Incorporation by reference; Intergovernmental relations; Lead; Nitrogen dioxide; Ozone; Particulate matter; Reporting and recordkeeping requirements; Sulfur oxides; Volatile organic compounds
Pages: 3

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on air pollution control · Rules on carbon monoxide · Rules on environmental protection · Published in January 2025

Read from the Federal Register API, last updated 2026-10-24. 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.