Data / Federal rules / 2025-15748

Air Plan Approval; Tennessee; Second Planning Period Regional Haze Plan

The Environmental Protection Agency published this proposed rule in the Federal Register on August 19, 2025. Comments closed on October 20, 2025.

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What the agency says

The Environmental Protection Agency (EPA) is proposing to approve a regional haze State Implementation Plan (SIP) revision submitted by the Tennessee Department of Environmental Conservation (TDEC), dated February 23, 2022, as satisfying the applicable requirements under the Clean Air Act (CAA or Act) and EPA's Regional Haze Rule (RHR) for the program's second planning period. Tennessee's SIP submission addresses the requirement that states must periodically revise their long-term strategies 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. The SIP submission also addresses other applicable requirements for the second planning period of the regional haze program. EPA is proposing this action pursuant to sections 110 and 169A of the Act.

Key facts

Document number: 2025-15748
Type: Proposed rule
Action: Proposed rule
Agency: Environmental Protection Agency
Published: August 19, 2025
Comments due: October 20, 2025
Dates: Written comments must be received on or before October 20, 2025.
Docket: EPA-R04-OAR-2019-0308; FRL-10404-01-R4
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Environmental protection; Incorporation by reference; Nitrogen dioxide; Particulate matter; Sulfur oxides
Pages: 24

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

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