Proposed rule · 2026-00782

Determination of Attainment by the Attainment Date; 1997 Ozone Standards; California; Coachella Valley

The Environmental Protection Agency (EPA) is proposing to determine that the Riverside County (Coachella Valley) 1997 ozone Extreme nonattainment area ("Coachella Valley") attained the 1997 ozone national ambient air quality standards (NAAQS) by its June 15, 2025, attainment date. This proposed determination is based on quality- assured and certified ambient air quality monitoring data from 2022 through 2024. We are taking comments on this proposal and plan to follow with a final action.