Air Plan Revisions; California; Antelope Valley Air Quality Management District; New Source Review; Stationary Source Permits

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 Part 52 [EPA-R09-OAR-2025-0056; FRL-12601-04-R9] AGENCY: Environmental Protection Agency (EPA). ACTION: Proposed rule and partial withdrawal of proposed rule. SUMMARY: The Environmental Protection Agency (EPA) is proposing approval of one permitting rule, submitted on October 16, 2025, as a revision to the Antelope Valley Air Quality Management District (AVAQMD or “District”) portion of the California State Implementation Plan (SIP). This revision concerns the District's New Source Review (NSR) permitting program for new and modified sources of air pollution under part D of title I of the Clean Air Act (CAA or “Act”). The AVAQMD amended and resubmitted the rule after the EPA identified deficiencies in an earlier proposed rulemaking on a previous submittal. In this action, the EPA is also withdrawing our proposed limited approval and limited disapproval of the previous version of this AVAQMD rule. If finalized, this action will update the AVAQMD's current SIP with the amended rule. We are taking comments on this proposal and plan to follow with a final action. DATES: Comments must be received on or before April 22, 2026. ADDRESSES: Submit your comments, identified by Docket ID No. EPA-R09-OAR-2025-0056 at https://www.regulations.gov . For comments submitted at Regulations.gov , follow the online instructions for submitting comments. Once submitted, comments cannot be edited or removed from Regulations.gov . The EPA…