Approval of Implementation Plans for Air Quality Planning Purposes; State of Nevada; Truckee Meadows Second 10-Year Maintenance Plan for the 1987 PM-10 Standard

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-2025-1978; FRL-13551-01-R9] AGENCY: Environmental Protection Agency (EPA). ACTION: Proposed rule. SUMMARY: The U.S. Environmental Protection Agency (EPA) is proposing to approve the “Second 10-Year Maintenance Plan for the Truckee Meadows 24-Hour PM 10 Attainment Area” (“Truckee Meadows Second PM 10 Maintenance Plan” or “Plan”) as a revision to the Washoe County portion of the State implementation plan (SIP) for the State of Nevada. The Truckee Meadows Second PM 10 Maintenance Plan includes, among other elements, a base year emissions inventory, a maintenance demonstration, contingency provisions, and motor vehicle emissions budgets for use in transportation conformity determinations. With this proposed rulemaking, the EPA is initiating the adequacy process for the 2025, 2030, and 2040 motor vehicle emissions budgets. The EPA is proposing these actions because the SIP revision meets the applicable statutory and regulatory requirements for such plans and motor vehicle emissions budgets. We are taking comments on this proposal and plan to follow with a final action. DATES: Comments must be received on or before November 2, 2026. ADDRESSES: Submit your comments, identified by Docket ID No. EPA-R09-OAR-2025-1978, at https://www.regulations.gov . For comments submitted at Regulations.gov , follow the online instructions for submitting comments. Once submitted, comments cannot be edited …