Data / Federal rules / 2026-06942

Air Plan Approvals; Indiana; Prong 4 (Visibility) for the 2015 Ozone National Ambient Air Quality Standard

The Environmental Protection Agency published this proposed rule in the Federal Register on April 10, 2026. Comments closed on May 11, 2026.

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What the agency says

The Environmental Protection Agency (EPA) is proposing to approve a portion of Indiana's State Implementation Plan (SIP) submission regarding the infrastructure requirements of section 110 of the Clean Air Act (CAA) for the 2015 ozone National Ambient Air Quality Standards (NAAQS). The infrastructure requirements are designed to ensure that the structural components of each State's air quality management program are adequate to meet the State's responsibilities under the CAA. The EPA is proposing that Indiana's infrastructure submission fulfills CAA requirements for a State's SIP to contain adequate provisions prohibiting emissions that will interfere with required visibility protection measures in any other State's SIP.

Key facts

Document number: 2026-06942
Type: Proposed rule
Action: Proposed rule
Agency: Environmental Protection Agency
Published: April 10, 2026
Comments due: May 11, 2026
Dates: Written comments must be received on or before May 11, 2026.
Docket: EPA-R05-OAR-2018-0788; FRL-13249-01-R5
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Environmental protection; Incorporation by reference; Nitrogen oxides; Ozone; Particulate matter; 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 April 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.