# 2026-01766: Determination of Attainment by the Attainment Date and Clean Data Determination; California, San Joaquin Valley 1997 Annual PM2.5 Fine Particulate Matter Nonattainment Area

2026-01766, Determination of Attainment by the Attainment Date and Clean Data Determination; California, San Joaquin Valley 1997 Annual PM2.5 Fine Particulate Matter Nonattainment Area, is a Federal Register rule from Environmental Protection Agency published 2026-01-29, effective 2026-03-02 (as of 2026-06-11).

- Canonical: https://policyrisk.com/federal-register/2026-01766
- As of: 2026-06-11
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-01766
- Title: Determination of Attainment by the Attainment Date and Clean Data Determination; California, San Joaquin Valley 1997 Annual PM2.5 Fine Particulate Matter Nonattainment Area
- Type: Rule
- Agencies: Environmental Protection Agency
- Citation: 91 FR 3836
- Published: 2026-01-29
- Effective: 2026-03-02
- Comments close: not stated
- Significant: no
- Touches household money: no
- Regulation identifier numbers: none
- Last updated: 2026-06-11

## Summary

The EPA has confirmed that the San Joaquin Valley in California met the 1997 air quality standards for fine particle pollution by the end of 2024. This means the area’s air is cleaner than before, based on recent data from 2022 to 2025. The new rule takes effect on March 2, 2026, helping local communities breathe easier without extra costs or restrictions.

## Abstract

The Environmental Protection Agency (EPA) is finalizing our determination that the San Joaquin Valley, California, fine particulate matter (PM<INF>2.5</INF>) nonattainment area attained the 1997 annual PM<INF>2.5</INF> national ambient air quality standards (NAAQS) by the December 31, 2024 applicable attainment date. This determination is based on ambient air quality monitoring data from 2022 through 2024. We are also making a clean data determination (CDD) based on the 2022 through 2024 data and our evaluation of preliminary air quality monitoring data from 2025.

## Effects PRIA read

- San Joaquin Valley Meets PM2.5 Standard: benefit, low. The EPA determined the San Joaquin Valley attained the 1997 annual PM2.5 standard by the December 31, 2024 attainment date based on 2022–2024 monitoring data and preliminary 2025 data. This final action is effective March 2, 2026 and formally recognizes that ambient PM2.5 levels in the area met the…
- Clean Data Determination Suspends SIP Submissions: benefit, low. Because of the Clean Data Determination (CDD) based on 2022–2024 data (and preliminary 2025 data), the EPA is suspending the San Joaquin Valley's obligation to submit attainment-planning State Implementation Plan (SIP) elements (including an attainment demonstration, reasonable further progress pla…
- Designation Remains Serious Nonattainment: mixed, low. The Clean Data Determination and attainment determination do not redesignate the San Joaquin Valley to attainment. The area remains designated as "Serious" nonattainment for the 1997 annual PM2.5 NAAQS until the EPA determines the area meets Clean Air Act requirements for redesignation, including a…
- No Additional Costs to Small Entities: benefit, low. The EPA certified that this final action will not impose any requirements or additional costs on small entities, and will not result in additional costs to state, local, or tribal governments or to the private sector beyond those imposed by state law.

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## Sources
- [2026-01766 on federalregister.gov](https://www.federalregister.gov/documents/2026/01/29/2026-01766/determination-of-attainment-by-the-attainment-date-and-clean-data-determination-california-san)
- [2026-01766 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-01-29/pdf/2026-01766.pdf)

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Source: PRIA, https://policyrisk.com/federal-register/2026-01766 (as of 2026-06-11).