Proposed rule · 2025-12856

Finding of Failure To Attain the 1997 8-Hour Ozone Standards; California; San Joaquin Valley

The Environmental Protection Agency (EPA) is proposing to determine that the San Joaquin Valley, California area failed to attain the 1997 8-hour ozone national ambient air quality standard by its June 15, 2024 "Extreme" area attainment date. This proposed determination is based on quality-assured and certified ambient air quality monitoring data from 2021 through 2023.