# Air Plan Approval; Ohio; Emergency Episodes and Ambient Air Quality Standards
> **Rule** · Direct final rule. · Published 2025-11-26 · Effective 2026-01-26 · 90 FR 54236
## Document
- **Document number:** 2025-21322
- **Category:** air-emissions
- **Federal Register citation:** 90 FR 54236
- **CFR reference:** 40 CFR 52
- **Publication date:** 2025-11-26
- **Effective date:** 2026-01-26
- **State:** OH
- **EPA docket:** EPA-R05-OAR-2025-0013
## Abstract

The Environmental Protection Agency (EPA) is approving amendments to Ohio Administrative Code (OAC) Chapter 3745-25, Emergency Episodes and Ambient Air Quality Standards, into Ohio's State Implementation Plan (SIP). The amendments to the rule include minor style changes, correct typographical errors, and update publication and referenced material titles, effective dates, and addresses.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/11/26/2025-21322/air-plan-approval-ohio-emergency-episodes-and-ambient-air-quality-standards)
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