Data / Federal rules / 2025-15455

Finding of Failure To Attain; Air Plan Approval; Indiana; Huntington County Sulfur Dioxide Attainment Plan

The Environmental Protection Agency published this final rule in the Federal Register on August 14, 2025. It took effect on September 15, 2025.

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What the agency says

The Environmental Protection Agency (EPA) is determining that the Huntington County, Indiana nonattainment area failed to attain the 2010 Sulfur Dioxide (SO<INF>2</INF>) National Ambient Air Quality Standard (NAAQS) by the applicable attainment date of April 9, 2023. EPA is also approving revisions into the Indiana State Implementation Plan (SIP) intended to provide for attainment of the 2010 SO<INF>2</INF> NAAQS for the Huntington County nonattainment area. These SIP revisions include Indiana's attainment demonstration and other planning elements required under the Clean Air Act (CAA), and an order issued by the Commissioner of the Indiana Department of Environmental Management containing enforceable emission limits. Further, EPA is determining that the provisions of Indiana's SIP submittal adequately provide for attainment of the NAAQS and that the plan meets all other applicable CAA requirements. EPA proposed to approve this action on June 18, 2025, and received no adverse comments.

Key facts

Document number: 2025-15455
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: August 14, 2025
Takes effect: September 15, 2025
Dates: This final rule is effective on September 15, 2025.
Docket: EPA-R05-OAR-2023-0564; FRL-12835-02-R5
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Environmental protection; Incorporation by reference; Intergovernmental relations; Reporting and recordkeeping requirements; Sulfur oxides
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 environmental protection · Rules on incorporation by reference · Published in August 2025

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.