# Approval and Promulgation of Air Quality Implementation Plans; West Virginia; Revisions to Regulation for Control of Ozone Season Nitrogen Oxide Emissions
> **Rule** · Final rule. · Published 2025-10-02 · Effective 2025-11-03 · 90 FR 47604
## Document
- **Document number:** 2025-19238
- **Category:** air-emissions
- **Federal Register citation:** 90 FR 47604
- **CFR reference:** 40 CFR 52
- **Publication date:** 2025-10-02
- **Effective date:** 2025-11-03
- **State:** VA
- **EPA docket:** EPA-R03-OAR-2024-0513
## Abstract

The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the State of West Virginia. The revision pertains to West Virginia 45 Code of State Rules (CSR) 40 (WV rule) that establishes the nitrogen oxides (NO<INF>X</INF>) ozone season limitations and requirements for non- electrical generating unit (EGU) large industrial boilers and combustion turbines that have a maximum design heat input of greater than 250 million British thermal units per hour (MMBtu/hr), as well as affected stationary internal combustion engines and cement manufacturing kilns. This action is being taken under the Clean Air Act (CAA).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/10/02/2025-19238/approval-and-promulgation-of-air-quality-implementation-plans-west-virginia-revisions-to-regulation)
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