Data / Federal rules / 2025-22564

Air Plan Approval; Tennessee; Second Period Regional Haze Plan

The Environmental Protection Agency published this final rule in the Federal Register on December 11, 2025. It took effect on January 12, 2026.

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What the agency says

The Environmental Protection Agency (EPA) is approving a regional haze State Implementation Plan (SIP) revision submitted by Tennessee Department of Environmental Conservation (TDEC), dated February 23, 2022, ("Haze Plan" or "2022 Plan"), as satisfying applicable requirements under the Clean Air Act (CAA or Act) and EPA's Regional Haze Rule (RHR) for the regional haze program's second planning period. Tennessee's SIP submission addresses the requirement that states must periodically revise their long-term strategies (LTSs) for making reasonable progress toward the national goal of preventing any future, and remedying any existing, anthropogenic impairment of visibility, including regional haze, in mandatory Class I Federal areas (hereinafter referred to as "Class I areas"). The SIP submission also addresses other applicable requirements for the second planning period of the regional haze program. EPA is taking this action pursuant to sections 110 and 169A of the Act.

Key facts

Document number: 2025-22564
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: December 11, 2025
Takes effect: January 12, 2026
Dates: This rule is effective January 12, 2026.
Docket: EPA-R04-OAR-2019-0308; FRL-10404-02-R4
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Environmental protection; Incorporation by reference; Nitrogen dioxide; 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 December 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.