Data / Federal rules / 2025-20672

Air Plan Approval; Indiana; Second Maintenance Plan for 2008 Ozone NAAQS

The Environmental Protection Agency published this proposed rule in the Federal Register on November 21, 2025. Comments closed on December 22, 2025.

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What the agency says

The Environmental Protection Agency (EPA) is proposing to approve a revision to the Indiana State Implementation Plan (SIP). On April 1, 2025, the Indiana Department of Environmental Management (IDEM) submitted a revision to the State's plan for maintaining the 2008 ozone National Ambient Air Quality Standard (NAAQS or standard) in the Indiana portion of the Cincinnati, Ohio-Kentucky-Indiana area. EPA is proposing to approve this maintenance plan because it provides for the maintenance of the 2008 ozone NAAQS for the area for 10 additional years as required by the Clean Air Act (CAA). EPA is also initiating the adequacy review process for motor vehicle emission budgets (Budgets) for the area. This action, if finalized, would make certain commitments related to maintenance of the 2008 ozone NAAQS in this area federally enforceable as part of the Indiana SIP.

Key facts

Document number: 2025-20672
Type: Proposed rule
Action: Proposed rule
Agency: Environmental Protection Agency
Published: November 21, 2025
Comments due: December 22, 2025
Dates: Comments must be received on or before December 22, 2025.
Docket: EPA-R05-OAR-2025-0167; FRL-12839-01-R5
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Environmental protection; Incorporation by reference; Intergovernmental relations; Nitrogen oxides; Ozone; Reporting and recordkeeping requirements; Volatile organic compounds
Pages: 6

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 November 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.