Determination of Attainment by the Attainment Date; 2008 8-Hour Ozone Standards; California; Sacramento Metro Area
air-emissions · Rule · Published 2025-08-21 · Effective 2025-09-22 · CA · 90 FR 40741
Document
Document number
2025-15990
Federal Register citation
90 FR 40741
CFR reference
40 CFR 52
Type
Rule
Action
Final determination.
Category
air-emissions
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.