Data / Federal rules / 2025-15440

Air Plan Approval; Missouri; Removal of Obsolete Rules on Control of NOX Emissions

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 taking final action to approve a revision to the State Implementation Plan (SIP) submitted by the Missouri Department of Natural Resources (MoDNR) on November 14, 2018. MoDNR requested that the EPA remove from its SIP two rules related to control of emissions of nitrogen oxides (NO<INF>X</INF>). One of the rules previously applied to electricity generating units (EGUs) and certain non-EGUs in a portion of the state and the other rule previously applied to EGUs throughout the entire state. The EPA has already approved a SIP revision that included provisions to sunset the two rules, and removal of the now-sunsetted rules from the SIP would not have an adverse effect on air quality. The EPA's approval of this rule revision is being done in accordance with the requirements of the Clean Air Act (CAA).

Key facts

Document number: 2025-15440
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-R07-OAR-2025-0138; FRL-12693-02-R7
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Environmental protection; Incorporation by reference; Ozone
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.