# Approval and Promulgation of Implementation Plans; State of California; Coachella Valley; Extreme Attainment Plan for 1997 8-Hour Ozone Standards
> **Rule** · Final rule. · Published 2025-01-21 · Effective 2025-02-20 · 90 FR 6823
## Document
- **Document number:** 2025-01110
- **Category:** air-emissions
- **Federal Register citation:** 90 FR 6823
- **CFR reference:** 40 CFR 52
- **Publication date:** 2025-01-21
- **Effective date:** 2025-02-20
- **State:** CA
- **EPA docket:** EPA-R09-OAR-2023-0448
## Abstract

The Environmental Protection Agency (EPA) is taking final action to approve elements of a state implementation plan (SIP) submittal from the State of California to meet Clean Air Act (CAA) "Extreme" nonattainment area requirements for the 1997 8-hour ozone national ambient air quality standards (NAAQS) in the Riverside Co. (Coachella Valley), CA nonattainment area ("Coachella Valley"). We are specifically approving the reasonable further progress (RFP) demonstration and the vehicle miles traveled demonstration.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/01/21/2025-01110/approval-and-promulgation-of-implementation-plans-state-of-california-coachella-valley-extreme)
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