Air Plan Approval; California; San Joaquin Valley 1-Hour Ozone Area; Maintenance Plan and Redesignation Request

Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Environmental Protection Agency 40 CFR Parts 52 and 81 [EPA-R09-OAR-2024-0611; FRL-12521-01-R9] AGENCY: Environmental Protection Agency (EPA). ACTION: Proposed rule. SUMMARY: The Environmental Protection Agency (EPA) is proposing to approve the “2023 Maintenance Plan and Redesignation Request for the Revoked ( printed page 26470) 1-Hour Ozone Standard” (“San Joaquin Valley Maintenance Plan” or “Plan”) as a revision to the state implementation plan (SIP) for the State of California. The San Joaquin Valley Maintenance Plan includes, among other elements, an emissions inventory consistent with attainment and contingency provisions. The EPA is also proposing to find that the State of California's request to redesignate the San Joaquin Valley area from nonattainment to attainment for the revoked 1979 1-hour national ambient air quality standard (NAAQS or “standard”) for ozone (“1979 ozone NAAQS,” “1-hour ozone NAAQS,” or “1-hour ozone standard”) meets all the Clean Air Act (CAA or “the Act”) criteria for redesignation. Therefore, the EPA is proposing to terminate all anti-backsliding obligations for the San Joaquin Valley area for the revoked 1-hour ozone NAAQS. DATES: Written comments must arrive on or before July 23, 2025. ADDRESSES: Submit your comments, identified by Docket ID No. EPA-R09-OAR-2024-0611at https://www.regulations.gov . For comments submitted at Regulations.gov , follo…