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

On January 15, 2026, the EPA proposed to determine that the Coachella Valley attained the revoked 1997 ozone national ambient air quality standards (NAAQS) of 0.08 parts per million (ppm) by its June 15, 2025, Extreme area attainment date. The EPA proposed these findings to fulfill our statutory obligation under Clean Air Act (CAA) section 181(b)(2) to determine whether an area has attained the relevant standards by the applicable attainment date. Previously, the EPA granted the nonattainment area a 1-year extension of the attainment date from June 15, 2024, to June 15, 2025.