Conditional Approval; Contingency Measure State Implementation Plan for the 2008 Ozone Standards; San Joaquin Valley, California

Document 2026-11168 is a Final Rule published by the Environmental Protection Agency in the Federal Register on June 4, 2026, with an effective date of July 6, 2026. The Environmental Protection Agency (EPA) is taking final action to conditionally approve a state implementation plan (SIP) submission under the Clean Air Act (CAA or "Act") that addresses the contingency measure requirements for the 2008 ozone national ambient air quality standards (NAAQS or "standards") for the San Joaquin Valley ozone nonattainment area. The SIP submission, titled the "Ozone Contingency Measure State Implementation Plan Revision for the 2008 and 2015 8-hour Ozone Standards" ("2024 SJV Ozone Contingency Measure Plan," "Contingency Measure Plan," or "Plan") relies on two ozone contingency measures that the EPA has already approved in separate rulemakings. The approval is conditional because it relies on commitments by the State air agency and regional air district to supplement the 2024 SJV Ozone Contingency Measure Plan with submission of specific additional contingency measures within one year of the EPA's final conditional approval. The EPA is taking final conditional approval action of the SIP submission because the Agency has determined that the existing approved contingency measures, the commitments to submit additional contingency measures, and the justification for not adopting contingency measures that would achieve the recommended amount for such measures, meet the applicable requirements for such SIP submissions for the San Joaquin Valley for the 2008 ozone NAAQS. This conditional approval adds the 2024 SJV Ozone Contingency Measure Plan to the federally enforceable California SIP. View the original at https://www.federalregister.gov/documents/2026/06/04/2026-11168/conditional-approval-contingency-measure-state-implementation-plan-for-the-2008-ozone-standards-san.

No. Document 2026-11168 is not classified as economically significant under Executive Order 12866. Economically significant rules require OIRA review and are estimated to have impacts of $100 million or more per year.