# 2026-16510: Plumas County Air: EPA Says 'Clean Enough' by Deadline

2026-16510, Determination of Attainment by the Attainment Date and Clean Data Determination for the 2012 Annual Fine Particulate Standard; Plumas County, California, is a Federal Register rule from Environmental Protection Agency published 2026-08-13, effective 2026-09-14; PRIA reads it as touching household money (as of 2026-08-20).

- Canonical: https://policyrisk.com/federal-register/2026-16510
- As of: 2026-08-20
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-16510
- Title: Determination of Attainment by the Attainment Date and Clean Data Determination for the 2012 Annual Fine Particulate Standard; Plumas County, California
- Type: Rule
- Agencies: Environmental Protection Agency
- Citation: 91 FR 52249
- Published: 2026-08-13
- Effective: 2026-09-14
- Comments close: not stated
- Significant: no
- Touches household money: yes
- Regulation identifier numbers: none
- Last updated: 2026-08-20

## In one line

Plumas County Air: EPA Says 'Clean Enough' by Deadline

## Summary

The Environmental Protection Agency (EPA) is finalizing our determination 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 determination is based on ambient air quality monitoring data from 2023 through 2025. We are also finalizing a clean data determination (CDD) based on the 2023 through 2025 data and our evaluation of preliminary air quality monitoring data from 2026.

## Effects PRIA read

- Portola Attained PM2.5; SIP Submissions Suspended: benefit, low. The EPA determined the Portola nonattainment area in Plumas County attained the 2012 annual PM2.5 standard by the December 31, 2025 attainment date based on 2023–2025 monitoring data and finalized a Clean Data Determination. Because of the Clean Data Determination, the state’s requirement to submit…
- No New Costs for Small Entities: benefit, low. The EPA certified under the Regulatory Flexibility Act that this action will not have a significant economic impact on a substantial number of small entities and that it will not impose any requirements on small entities beyond those imposed by state law.
- Emissions Inventories, BACT, NSR Still Required: cost, low. The EPA stated that even with the Clean Data Determination, the requirements to submit emissions inventories, implement best available control measures (including control technologies), and maintain a nonattainment new source review (NSR) permitting program for the Serious nonattainment area remain…

## Related documents

- [2026-22082](https://policyrisk.com/federal-register/2026-22082): Additional Reconsideration Standards of Performance for New, Reconstructed, and Modified Sources and Emissions Guidelines for Existing Sour…, 2026-10-29
- [2026-21155](https://policyrisk.com/federal-register/2026-21155): Renewable Fuel Standard (RFS) Program: Reallocation of Additional 2025 Small Refinery Exemptions, 2026-10-16
- [2026-20849](https://policyrisk.com/federal-register/2026-20849): Clean Water Act Hazardous Substance Facility Response Plans: Compliance Date Delay and Changes To Reflect Administration Policy, 2026-10-13
- [2026-19071](https://policyrisk.com/federal-register/2026-19071): Partial Repeal of the Carbon Pollution Standards for Fossil Fuel-Fired Electric Generating Units, 2026-09-17
- [2026-19072](https://policyrisk.com/federal-register/2026-19072): Rescission of the Greenhouse Gas Findings for Fossil Fuel-Fired Power Plants and Repeal of Regulations for Power Plant Greenhouse Gas Emiss…, 2026-09-17
- [2026-18317](https://policyrisk.com/federal-register/2026-18317): Updated Definition of “Waters of the United States”, 2026-09-09

## Sources
- [2026-16510 on federalregister.gov](https://www.federalregister.gov/documents/2026/08/13/2026-16510/determination-of-attainment-by-the-attainment-date-and-clean-data-determination-for-the-2012-annual)
- [2026-16510 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-08-13/pdf/2026-16510.pdf)

## Related
- [Previous: 2026-16508, Medicaid Program; Prohibition on Federal Medicaid and Children's Health Insuran…](https://policyrisk.com/federal-register/2026-16508)
- [Next: 2026-16511, Determination of Attainment by the Attainment Date; 1997 Ozone Standards; Calif…](https://policyrisk.com/federal-register/2026-16511)
- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2026-16510 (as of 2026-08-20).