{"abstract":"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.","action":"Final rule.","agencies":[{"raw_name":"ENVIRONMENTAL PROTECTION AGENCY","name":"Environmental Protection Agency","id":145,"url":"https://www.federalregister.gov/agencies/environmental-protection-agency","json_url":"https://www.federalregister.gov/api/v1/agencies/145","parent_id":null,"slug":"environmental-protection-agency"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2026/08/13/2026-16510.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"52","title":40}],"citation":"91 FR 52249","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This rule is effective September 14, 2026.","disposition_notes":null,"docket_ids":["EPA-R09-OAR-2026-2608","FRL-13323-02-R9"],"dockets":[{"supporting_documents":[{"title":"NFRM Docket Index_Portola CDD DAAD","document_id":"EPA-R09-OAR-2026-2608-0011"},{"title":"G. Notice of Final Rulemaking","document_id":"EPA-R09-OAR-2026-2608-0010"},{"title":"F. Additional Documents for Final Rulemaking","document_id":"EPA-R09-OAR-2026-2608-0009"},{"title":"NPRM Docket Index_Portola CDD DAAD","document_id":"EPA-R09-OAR-2026-2608-0006"},{"title":"D. Notice of Proposed Rulemaking","document_id":"EPA-R09-OAR-2026-2608-0005"},{"title":"C. Additional Documents for Proposed Rulemaking","document_id":"EPA-R09-OAR-2026-2608-0004"},{"title":"B. State Plans, Support Documents, Reports, and Correspondence","document_id":"EPA-R09-OAR-2026-2608-0003"},{"title":"A. U.S. EPA Guidance Documents, Policies, and Rulemakings","document_id":"EPA-R09-OAR-2026-2608-0002"}],"agency_name":"EPA","documents":[{"comment_count":0,"comment_start_date":"2026-08-13","updated_at":"2026-08-13T13:56:20.352-04:00","comment_url":"https://www.regulations.gov/commenton/EPA-R09-OAR-2026-2608-0008","allow_late_comments":false,"id":"EPA-R09-OAR-2026-2608-0008","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":8,"id":"EPA-R09-OAR-2026-2608","title":"Determination of Attainment by the Attainment Date and Clean Data Determination for the 2012 Annual Fine Particulate Standard; Plumas County, California"}],"document_number":"2026-16510","effective_on":"2026-09-14","end_page":52251,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/08/13/2026-16510.xml","html_url":"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","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-16510?publication_date=2026-08-13","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-08-13/2026-16510/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":200,"last_updated":"2026-10-24 22:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-08-13/pdf/2026-16510.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-16510.pdf?1786538715","publication_date":"2026-08-13","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/08/13/2026-16510.txt","regulation_id_number_info":{},"regulation_id_numbers":[],"regulations_dot_gov_info":{"supporting_documents":[{"title":"NFRM Docket Index_Portola CDD DAAD","document_id":"EPA-R09-OAR-2026-2608-0011"},{"title":"G. Notice of Final Rulemaking","document_id":"EPA-R09-OAR-2026-2608-0010"},{"title":"F. Additional Documents for Final Rulemaking","document_id":"EPA-R09-OAR-2026-2608-0009"},{"title":"NPRM Docket Index_Portola CDD DAAD","document_id":"EPA-R09-OAR-2026-2608-0006"},{"title":"D. Notice of Proposed Rulemaking","document_id":"EPA-R09-OAR-2026-2608-0005"},{"title":"C. Additional Documents for Proposed Rulemaking","document_id":"EPA-R09-OAR-2026-2608-0004"},{"title":"B. State Plans, Support Documents, Reports, and Correspondence","document_id":"EPA-R09-OAR-2026-2608-0003"},{"title":"A. U.S. EPA Guidance Documents, Policies, and Rulemakings","document_id":"EPA-R09-OAR-2026-2608-0002"}],"comments_count":0,"agency_id":"EPA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=EPA-R09-OAR-2026-2608","supporting_documents_count":8,"docket_id":"EPA-R09-OAR-2026-2608","document_id":"EPA-R09-OAR-2026-2608-0008","regulation_id_number":null,"title":"Determination of Attainment by the Attainment Date and Clean Data Determination for the 2012 Annual Fine Particulate Standard; Plumas County, California","checked_regulationsdotgov_at":"2026-08-14T20:55:13Z"},"regulations_dot_gov_url":null,"significant":null,"signing_date":null,"start_page":52249,"subtype":null,"title":"Determination of Attainment by the Attainment Date and Clean Data Determination for the 2012 Annual Fine Particulate Standard; Plumas County, California","toc_doc":"California; Determination of Attainment by the Attainment Date and Clean Data Determination for the 2012 Annual Fine Particulate Standard","toc_subject":"Air Quality State Implementation Plans; Approvals and Promulgations","topics":["Air pollution control","Environmental protection","Incorporation by reference","Particulate matter","Reporting and recordkeeping requirements"],"type":"Rule","volume":91}