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

<RULE> ENVIRONMENTAL PROTECTION AGENCY <CFR>40 CFR Part 52</CFR> <DEPDOC>[EPA-R09-OAR-2025-0292; FRL-12825-02-R9]</DEPDOC> <SUBJECT> Determination of Attainment by the Attainment Date and Clean Data Determination; California, San Joaquin Valley 1997 Annual PM <E T="0735">2.5</E> Fine Particulate Matter Nonattainment Area </SUBJECT> <HD SOURCE="HED">AGENCY:</HD> Environmental Protection Agency (EPA). <HD SOURCE="HED">ACTION:</HD> Final rule. <SUM> <HD SOURCE="HED">SUMMARY:</HD> The Environmental Protection Agency (EPA) is finalizing our determination that the San Joaquin Valley, California, fine particulate matter (PM <E T="52">2.5</E> ) nonattainment area attained the 1997 annual PM <E T="52">2.5</E> 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. </SUM> <EFFDATE> <HD SOURCE="HED">DATES:</HD> This rule is effective March 2, 2026. </EFFDATE> <HD SOURCE="HED">ADDRESSES:</HD> The EPA has established a docket for this action under Docket ID No. EPA-R09-OAR-2025-0292. All documents in the docket are listed on the <E T="03">https://www.regulations.gov</E> website. Although listed in the index, some information is not publicly available, <E T="03">e.g.,</E> Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Certain other material, such as copyrighted material, is not placed on the internet and will be publicly available only in hard copy form. Publicly available docket materials are available through <E T="03">https://www.regulations.gov,</E> or please contact the person identified in the <E T="02">FOR FURTHER INFORMATION CONTACT</E> section for additional availability information. If you need assistance in a language other than English or if you are a person with a disability who needs a reasonable accommodation at no cost to you, please contact the person identified in the <E T="02">FOR FURTHER INFORMATION CONTACT</E> section. <FURINF> <HD SOURCE="HED">FOR FURTHER INFORMATION CONTACT:</HD> Ashley Graham, Geographic Strategies and Modeling Section (AIR-2-2), EPA Region IX, 75 Hawthorne Street, San Francisco, CA 94105; telephone number: (415) 972-3877; email address: <E T="03">graham.ashleyr@epa.gov.</E> </FURINF> <SUPLINF> <HD SOURCE="HED">SUPPLEMENTARY INFORMATION:</HD> Throughout this document, “we,” “us,” and “our” refer to the EPA. <HD SOURCE="HD1">Table of Contents </HD> <EXTRACT> <FP SOURCE="FP-2">I. Summary of the Proposed Action</FP> <FP SOURCE="FP-2">II. Public Comment</FP> <FP SOURCE="FP-2">III. Final Action</FP> <FP SOURCE="FP-2">IV. Statutory and Executive Order Reviews</FP> </EXTRACT> <HD SOURCE="HD1">I. Summary of the Proposed Action</HD> On July 16, 2025, the EPA proposed to determine, based on complete (or otherwise validated), quality-assured, and certified data meeting the requirements of 40 CFR part 50, appendix N for 2022 through 2024, that the San Joaquin Valley PM <E T="52">2.5</E> nonattainment area attained the 1997 annual PM <E T="52">2.5</E> NAAQS by its December 31, 2024 attainment date. <SU>1</SU> <FTREF/> <FTNT> <SU>1</SU>  90 FR 31906 (July 16, 2025). </FTNT> In accordance with 40 CFR 51.1015, we also proposed to issue a CDD for the San Joaquin Valley PM <E T="52">2.5</E> nonattainment area for the 1997 annual PM <E T="52">2.5</E> NAAQS. <SU>2</SU> <FTREF/> We proposed to issue a CDD based on our determination that the San Joaquin Valley had attained and was currently attaining the 1997 annual PM <E T="52">2.5</E> NAAQS. <SU>3</SU> <FTREF/> <FTNT> <SU>2</SU>  Id. </FTNT> <FTNT> <SU>3</SU>  The EPA evaluated preliminary data available in the EPA's Air Quality System (AQS) for 2025 (January through March). These data indicated that the San Joaquin Valley area continued to show concentrations below the level of the 1997 annual PM <E T="52">2.5</E> NAAQS. Id. at 31910. </FTNT> The EPA's proposal explained that if we were to finalize the CDD, the requirements for the area to submit attainment planning provisions to meet the requirements for an attainment plan for the 1997 annual PM <E T="52">2.5</E> NAAQS, including an attainment demonstration, reasonable further progress plan, quantitative milestones, quantitative milestone reports, and contingency measures, would be suspended until such time as: (1) the area is redesignated to attainment, after which such requirements are permanently discharged; or (2) the EPA determines that the area has re-violated the PM <E T="52">2.5</E> NAAQS, at which time the state shall submit such attainment plan elements for the nonattainment area by a future date to be determined by the EPA and announced through publication in the <E T="04">Federal Register</E> at the time the EPA determines the area is violating the PM <E T="52">2.5</E> NAAQS. Finally, the EPA's proposal explained that the CDD does not constitute a redesignation to attainment. The San Joaquin Valley PM <E T="52">2.5</E> nonattainment area will remain designated nonattainment for the 1997 annual PM <E T="52">2.5</E> NAAQS until such time as the EPA determines, pursuant to sections 107 and 175A of the Clean Air Act (CAA), that the San Joaquin Valley PM <E T="52">2.5</E> nonattainment area meets the CAA requirements for redesignation to attainment, including an approved maintenance plan showing that the area will continue to meet the 1997 annual PM <E T="52">2.5</E> NAAQS for 10 years. <SU>4</SU> <FTREF/> <FTNT> <SU>4</SU>  Id. </FTNT> Please see our July 16, 2025 proposed rulemaking for additional background and a detailed explanation of the rationale for our proposed action. <SU>5</SU> <FTREF/> <FTNT> <SU>5</SU>  90 FR 31906 (July 16, 2025). </FTNT> <HD SOURCE="HD1">II. Public Comment</HD> The public comment period for the proposed rulemaking opened on July 16, 2025, <SU>6</SU> <FTREF/> the date of its publication in the <E T="04">Federal Register</E> , and closed on August 15, 2025. During this period, the EPA received two comment submissions, including one comment submission from an anonymous private citizen  <SU>7</SU> <FTREF/> and one comment letter from San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD). <SU>8</SU> <FTREF/> Both comments are included in the docket for this action. <FTNT> <SU>6</SU>  Id. </FTNT> <FTNT> <SU>7</SU>  Comment dated and received August 5, 2025, submitted anonymously to Docket ID No. EPA-R09-OAR-2025-0292. </FTNT> <FTNT> <SU>8</SU>  Letter dated August 15, 2025, from Emily Kneeland, Director of Air Quality Planning, SJVUAPCD, to Docket ID No. EPA-R09-OAR-2025-0292, Subject: “RE: Docket No. EPA-R09-OAR-2025-0292, Determination of Attainment by the Attainment Date and Clean Data Determination; California, San Joaquin Valley 1997 Annual PM <E T="52">2.5</E> Fine Particulate Matter Nonattainment Area.” </FTNT> The comment submission from SJVUAPCD was supportive of our proposal to determine that the San Joaquin Valley attained the 1997 annual PM <E T="52">2.5</E> NAAQS by the December 31, 2024 attainment date and to issue a CDD for the area. The comment submission from the private citizen commenter was not germane to the action. We did not receive any comments that opposed the EPA's proposal to make an attainment determination by the applicable attainment date and issue a CDD. Thus, the comments received do not require a response. <HD SOURCE="HD1">III. Final Action</HD> For the reasons discussed in detail in our proposed action, the EPA is finalizing our determination that the San Joaquin Valley nonattainment area has attained the 1997 annual PM <E T="52">2.5</E> NAAQS by the December 31, 2024 attainment date, based on complete, quality-assured, and certified ambient air quality monitoring data for the 2022-2024 monitoring period. <SU>9</SU> <FTREF/> The EPA is taking this final action pursuant to CAA sections 179(c)(1). <FTNT> <SU>9</SU>  EPA, AQS Design Value Report (AMP480), Report Request ID: 2335768, November 28, 2025. </FTNT> Preliminary data available in the EPA's Air Quality System (AQS) for 2025 (January through October) indicate that the San Joaquin Valley area continues to show concentrations consistent with attainment of the 1997 annual PM <E T="52">2.5</E> NAAQS;  <SU>10</SU> <FTREF/> therefore, as provided in 40 CFR 51.1015, we are also finalizing a CDD. Consequently, the requirements for this area to submit any SIP revisions related to attainment of the 1997 annual PM <E T="52">2.5</E> NAAQS, including an attainment demonstration, reasonable further progress plan, quantitative milestones, quantitative milestone reports, and contingency measures, will be suspended for so long as the area continues to attain those NAAQS. This final determination that the San Joaquin Valley nonattainment area has attained the 1997 annual PM <E T="52">2.5</E> NAAQS does not constitute a redesignation of the area to attainment. The designation status of the San Joaquin Valley area will remain “Serious” nonattainment for the 1997 annual PM <E T="52">2.5</E> NAAQS until such time as the EPA determines, pursuant to sections 107 and 175A of the CAA, that the area meets the CAA requirements for redesignation to attainment, including an approved maintenance plan showing that the area will continue to meet the standards for 10 years. <FTNT> <SU>10</SU>  EPA, AQS Design Value Report (AMP480), Report Request ID: 2344358, January 8, 2026. </FTNT> <HD SOURCE="HD1">IV. Statutory and Executive Order Reviews</HD> Additional inform ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Preview showing 10k of 17k characters. Full document text is stored and available for version comparison. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━