# Determination of Attainment by the Attainment Date; 2008 8-Hour Ozone Standards; California; Sacramento Metro Area
> **Rule** · Final determination. · Published 2025-08-21 · Effective 2025-09-22 · 90 FR 40741
## Document
- **Document number:** 2025-15990
- **Category:** air-emissions
- **Federal Register citation:** 90 FR 40741
- **CFR reference:** 40 CFR 52
- **Publication date:** 2025-08-21
- **Effective date:** 2025-09-22
- **State:** CA
- **EPA docket:** EPA-R09-OAR-2025-0070
## Abstract

The Environmental Protection Agency (EPA) is finalizing our determination that the Sacramento Metro, California area attained the 2008 8-hour ozone national ambient air quality standards (NAAQS) by its December 31, 2024 attainment date. This determination is based on quality-assured and certified ambient air quality monitoring data from 2022 through 2024. We are also finalizing a determination that the requirement for the State to have contingency measures for reasonable further progress (RFP) and attainment for the 2008 ozone NAAQS no longer applies for this area.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/08/21/2025-15990/determination-of-attainment-by-the-attainment-date-2008-8-hour-ozone-standards-california-sacramento)
---
*AI Analytics · CC0 1.0*