Finding of Failure To Attain the 1997 8-Hour Ozone Standards; California; San Joaquin Valley
air-emissions · Rule · Published 2025-09-25 · Effective 2025-10-27 · CA · 90 FR 46065
Document
Document number
2025-18636
Federal Register citation
90 FR 46065
CFR reference
40 CFR 52
Type
Rule
Action
Final determination.
Category
air-emissions
Publication date
2025-09-25
Effective date
2025-10-27
State
CA
EPA docket
EPA-R09-OAR-2024-0587
Abstract
The Environmental Protection Agency (EPA) has determined that the San Joaquin Valley, California area failed to attain the 1997 8- hour ozone national ambient air quality standard (NAAQS) by its June 15, 2024 "Extreme" area attainment date. This determination is based on quality-assured and certified ambient air quality monitoring data from 2021 through 2023. As a result of this determination, the State of California is required to implement nonattainment contingency measures and the stationary source fee program required under Clean Air Act (CAA) section 185.