{"source":"reg-epa-air","note":"Free 5-item preview. The full feed is $0.05/call at GET /v1/reg-epa-air/changes.","question":"Which final or proposed federal rules affecting air quality & emissions were published since T, and which carry compliance obligations?","sample":[{"source":"reg-epa-air","entityId":"fedreg:2026-11168","type":"final_rule","title":"Conditional Approval; Contingency Measure State Implementation Plan for the 2008 Ozone Standards; San Joaquin Valley, California","summary":"The Environmental Protection Agency (EPA) is taking final action to conditionally approve a state implementation plan (SIP) submission under the Clean Air Act (CAA or \"Act\") that addresses the contingency measure requirements for the 2008 ozone national ambient air quality standards (NAAQS or \"standards\") for the San Joaquin Valley ozone nonattainment area. The SIP submission, titled the \"Ozone Contingency Measure State Implementation Plan Revision for the 2008 and 2015 8-hour Ozone Standards\" (\"2024 SJV Ozone Contingency Measure Plan,\" \"Contingency Measure Plan,\" or \"Plan\") relies on two ozo…","significance":8,"detectedAt":"2026-07-14T22:19:09.945Z","effectiveDate":"2026-07-06","sourceUrl":"https://www.federalregister.gov/documents/2026/06/04/2026-11168/conditional-approval-contingency-measure-state-implementation-plan-for-the-2008-ozone-standards-san","detail":{"documentNumber":"2026-11168","documentType":"Rule","agencies":"Environmental Protection Agency","publicationDate":"2026-06-04","vertical":"reg-epa-air"}},{"source":"reg-epa-air","entityId":"fedreg:2026-11169","type":"final_rule","title":"Revisions of the Nonattainment Designation for the 2008 and 2015 Ozone Standards and Clean Data Determinations for the 2008 and 2015 Ozone Standards: Cecil County, MD and New Castle County, DE","summary":"The Environmental Protection Agency (EPA) is approving two separate requests from Maryland and Delaware to revise the designation for the Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE nonattainment area for the 2008 primary and secondary ozone national ambient air quality standards (NAAQS) and the 2015 primary and secondary ozone NAAQS. Due to the concurrent requests from Maryland and Delaware, the EPA is revising the Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE nonattainment area boundary into three distinct nonattainment areas that together cover the identical geographic area of …","significance":6,"detectedAt":"2026-07-14T22:19:09.945Z","effectiveDate":"2026-07-06","sourceUrl":"https://www.federalregister.gov/documents/2026/06/04/2026-11169/revisions-of-the-nonattainment-designation-for-the-2008-and-2015-ozone-standards-and-clean-data","detail":{"documentNumber":"2026-11169","documentType":"Rule","agencies":"Environmental Protection Agency","publicationDate":"2026-06-04","vertical":"reg-epa-air"}},{"source":"reg-epa-air","entityId":"fedreg:2026-11170","type":"final_rule","title":"Clean Air Act Title V Operating Permit Program Revision; District of Columbia","summary":"The Environmental Protection Agency (EPA) is approving a revision to the District of Columbia (DC, the District's) title V operating permits program, submitted on behalf of the District by the Department of Energy and Environment (DOEE). The revision will update the title V operating permit fees collected by DOEE in order to ensure that the title V operating program will continue to be adequately funded. The revision also reorganized some sections in Chapter 3 of 20 District of Columbia Municipal Regulations (20 DCMR) with no substantive change in content. The EPA is approving these revisions…","significance":8,"detectedAt":"2026-07-14T22:19:09.945Z","effectiveDate":"2026-07-06","sourceUrl":"https://www.federalregister.gov/documents/2026/06/04/2026-11170/clean-air-act-title-v-operating-permit-program-revision-district-of-columbia","detail":{"documentNumber":"2026-11170","documentType":"Rule","agencies":"Environmental Protection Agency","publicationDate":"2026-06-04","vertical":"reg-epa-air"}},{"source":"reg-epa-air","entityId":"fedreg:2026-11360","type":"final_rule","title":"Extending the Reporting Deadline Under the Greenhouse Gas Reporting Rule for 2025; Correction","summary":"The Environmental Protection Agency (EPA) is correcting the preamble of a final rule published in the Federal Register on February 27, 2026. The final rule extended the reporting deadline under the Greenhouse Gas Reporting Rule, commonly referred to as the Greenhouse Gas Reporting Program (GHGRP), for reporting year 2025 from March 31, 2026, to October 30, 2026. This document corrects an inadvertent typographical error in the Federal Register. This correction does not result in any substantive changes to the final rule.","significance":8,"detectedAt":"2026-07-14T22:19:09.945Z","effectiveDate":"2026-06-05","sourceUrl":"https://www.federalregister.gov/documents/2026/06/05/2026-11360/extending-the-reporting-deadline-under-the-greenhouse-gas-reporting-rule-for-2025-correction","detail":{"documentNumber":"2026-11360","documentType":"Rule","agencies":"Environmental Protection Agency","publicationDate":"2026-06-05","vertical":"reg-epa-air"}},{"source":"reg-epa-air","entityId":"fedreg:2026-11432","type":"final_rule","title":"Air Plan Approval; Minnesota; Revision to Taconite Federal Implementation Plan","summary":"The U.S. Environmental Protection Agency (EPA) is revising the Original 2013 Federal Implementation Plan (FIP) by finalizing nitrogen oxide (NOX) emission limits for the indurating furnace at United States Steel's (U.S. Steel) Keetac taconite facility (Keetac) in Keewatin, Minnesota to satisfy the requirement for best available retrofit technology (BART) at taconite facilities. The EPA is finalizing the following NOX BART emission limits for the Keetac Grate Kiln indurating furnace, with compliance to be determined on a rolling 720-hour average: 3.4 pounds (lbs) of NO