Data / Federal rules / 2026-09604

Determination of Attainment by the Attainment Date and Clean Data Determination for the 2012 Annual Fine Particulate Standard; Plumas County, California

The Environmental Protection Agency published this proposed rule in the Federal Register on May 14, 2026. Comments closed on June 15, 2026.

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What the agency says

The Environmental Protection Agency (EPA) is proposing to determine that the Portola nonattainment area in Plumas County, California, attained the 2012 annual fine particulate matter ("PM<INF>2.5</INF>") national ambient air quality standard (NAAQS or "standard") by the December 31, 2025 "Serious" area attainment date. This proposed determination is based on ambient air quality monitoring data from 2023 through 2025. We are also proposing to make a clean data determination (CDD) based on the 2023 through 2025 data. If we finalize this CDD, certain Clean Air Act (CAA) requirements that apply to the Portola nonattainment area will be suspended for so long as the area continues to meet the 2012 annual PM<INF>2.5</INF> NAAQS. The area would remain designated nonattainment for the 2012 annual PM<INF>2.5</INF> NAAQS, unless and until the State submits, and EPA approves, a redesignation request and maintenance plan for the area. We are taking comments on this proposal and plan to follow with a final action.

Key facts

Document number: 2026-09604
Type: Proposed rule
Action: Proposed rule
Agency: Environmental Protection Agency
Published: May 14, 2026
Comments due: June 15, 2026
Dates: Comments must be received on or before June 15, 2026.
Docket: EPA-R09-OAR-2026-2608; FRL-13323-01-R9
Code of Federal Regulations: 40 CFR 52; 40 CFR 81
Topics: Administrative practice and procedure; Air pollution control; Environmental protection; Incorporation by reference; Intergovernmental relations; Particulate matter; Reporting and recordkeeping requirements
Pages: 6

The document on federalregister.gov PDF

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Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.