{"abstract":"The Environmental Protection Agency (EPA) is finalizing its finding that the tribal portions of the Greater Connecticut area (the Mashantucket Pequot Tribal Nation and the Mohegan Indian Tribe) did not attain the 2015 ozone National Ambient Air Quality Standards (NAAQS) by the attainment date and a reclassification of those portions of the area to Serious nonattainment for the 2015 ozone NAAQS. Additionally, the EPA is taking final action on an exceptional events request submitted by CT DEEP on July 1, 2024, and the EPA's July 22, 2024 concurrence and nonconcurrence with CT DEEP's request. This final action fulfills the EPA's statutory obligation to determine whether the Mashantucket Pequot Tribal Nation and the Mohegan Indian Tribe's portions of the Greater Connecticut area attained the NAAQS by the attainment date. This action is being taken in accordance with the Clean Air Act.","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/2026/04/23/2026-07889.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"81","title":40}],"citation":"91 FR 21729","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This rule is effective on May 26, 2026.","disposition_notes":null,"docket_ids":["EPA-R01-OAR-2024-0325","FRL-13014-02-R1"],"dockets":[],"document_number":"2026-07889","effective_on":"2026-05-26","end_page":21731,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/04/23/2026-07889.xml","html_url":"https://www.federalregister.gov/documents/2026/04/23/2026-07889/finding-of-failure-to-attain-and-reclassification-of-tribal-portions-of-the-greater-connecticut","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-07889?publication_date=2026-04-23","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-04-23/2026-07889/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":87,"last_updated":"2026-04-23 22:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-04-23/pdf/2026-07889.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-07889.pdf?1776861913","publication_date":"2026-04-23","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/04/23/2026-07889.txt","regulation_id_number_info":{},"regulation_id_numbers":[],"regulations_dot_gov_info":{"supporting_documents":[{"title":"Mohegan Indian Tribe - 2015 O3 Serious Notification Letter","document_id":"EPA-R01-OAR-2024-0325-0022"},{"title":"Mashantucket Pequot Tribal Nation - 2015 O3 Notification Letter","document_id":"EPA-R01-OAR-2024-0325-0021"},{"title":"EPA Ltr. to CT_EE Initial Notification Response_3-7-2024","document_id":"EPA-R01-OAR-2024-0325-0020"},{"title":"Initial Notification of Potential Exceptional Events for Ozone in the Greater Connecticut Nonattainment Area","document_id":"EPA-R01-OAR-2024-0325-0019"},{"title":"Ltr_to_Mashantucket-Pequot_Tribe","document_id":"EPA-R01-OAR-2024-0325-0018"},{"title":"Ltr_to_Mohegan_Tribe","document_id":"EPA-R01-OAR-2024-0325-0017"},{"title":"Exceptional Events Demonstration 2023 -- FINAL","document_id":"EPA-R01-OAR-2024-0325-0016"},{"title":"CT_EE_Final Demo Cover Letter_7-22-2024_Signed","document_id":"EPA-R01-OAR-2024-0325-0015"},{"title":"Response to Comments","document_id":"EPA-R01-OAR-2024-0325-0014"},{"title":"Connecticut Ozone Reclassification Request 6.13.2024","document_id":"EPA-R01-OAR-2024-0325-0013"}],"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-R01-OAR-2024-0325","supporting_documents_count":20,"docket_id":"EPA-R01-OAR-2024-0325","document_id":"EPA-R01-OAR-2024-0325-0023","regulation_id_number":null,"title":"Designations of Areas for Air Quality Planning Purposes; Greater Connecticut; 8-Hour Ozone Nonattainment Area; Reclassification to Serious","checked_regulationsdotgov_at":"2026-04-23T14:55:04Z"},"regulations_dot_gov_url":null,"significant":null,"signing_date":null,"start_page":21729,"subtype":null,"title":"Finding of Failure To Attain and Reclassification of Tribal Portions of the Greater Connecticut Ozone Nonattainment Area as Serious for the 2015 Ozone National Ambient Air Quality Standards","toc_doc":"Connecticut; Finding of Failure to Attain and Reclassification of Tribal Portions of the Greater Connecticut Ozone Nonattainment Area as Serious for the 2015 Ozone National Ambient Air Quality Standards","toc_subject":"Air Quality State Implementation Plans; Approvals and Promulgations","topics":["Air pollution control","Carbon monoxide","Environmental protection","Intergovernmental relations","Lead","Ozone","Reporting and recordkeeping requirements","Sulfur oxides","Volatile organic compounds"],"type":"Rule","volume":91}