{"abstract":"The Environmental Protection Agency (EPA) is finalizing amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for the Chemical Manufacturing Area Source (CMAS) categories pursuant to a technology review under Clean Air Act (CAA) section 112(d)(6). Specifically, the EPA is finalizing new leak detection and repair (LDAR) requirements for equipment leaks and heat exchange systems in organic hazardous air pollutant (HAP) service. In addition, the EPA is taking final action to add standards for pressure relief devices (PRDs) and pressure vessels; require electronic reporting for notification of compliance status (NOCS), performance test reports, and periodic reports; and require continuous performance testing of non-flare air pollution control devices (APCD). The EPA is not finalizing the proposed area source category for chemical manufacturing with ethylene oxide (EtO) or related standards at this time.","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/2026/04/01/2026-06304.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"63","title":40}],"citation":"91 FR 16502","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This final rule is effective on April 1, 2026. The Director of the Federal Register (FR) has approved incorporation by reference of certain publications listed in the rule as of April 1, 2026.","disposition_notes":null,"docket_ids":["EPA-HQ-OAR-2024-0303","FRL-7623-02-OAR"],"dockets":[{"supporting_documents":[{"title":"Summary of Public Comments and Responses for National Emission Standards for Hazardous Air Pollutants for Chemical Manufacturing Area Sources","document_id":"EPA-HQ-OAR-2024-0303-0092"},{"title":"Documentation of EO 12866 Review of the CMAS NESHAP Technology Review Final Rulemaking","document_id":"EPA-HQ-OAR-2024-0303-0089"},{"title":"Documentation of Meetings with Industry Stakeholders - August and September","document_id":"EPA-HQ-OAR-2024-0303-0084"},{"title":"Transcript of Virtual Public Hearing for the Proposed CMAS NESHAP 02202025","document_id":"EPA-HQ-OAR-2024-0303-0057"},{"title":"SPPD CMAS Comment Extension Letter 3.12.25","document_id":"EPA-HQ-OAR-2024-0303-0054"},{"title":"Information Collection - Request Supporting Statement, Chemical Manufacturing Area Sources (CMAS) (Subpart VVVVVV) (Proposed Rule)","document_id":"EPA-HQ-OAR-2024-0303-0039"},{"title":"Proposed Regulation Edits for 40 CFR Part 63 Subpart VVVVVV: National Emission Standards for Hazardous Air Pollutants for Chemical Manufacturing Area Sources","document_id":"EPA-HQ-OAR-2024-0303-0038"},{"title":"Clean Air Act Section 112(d)(5) GACT Standard Analysis for Pressure Vessels Associated with Processes Subject to the CMAS NESHAP","document_id":"EPA-HQ-OAR-2024-0303-0035"},{"title":"Clean Air Act Section 112(d)(5) GACT Standard Analysis for Pressure Relief Devices Associated with Processes Subject to the CMAS NESHAP","document_id":"EPA-HQ-OAR-2024-0303-0032"},{"title":"Clean Air Act Section 112(d)(5) GACT Standard Analysis and CAA Section 112(d)(6) Technology Review for Fenceline Monitoring for Chemical Manufacturing Process Units Associated with the Chemical Manufacturing Area Sources NESHAP","document_id":"EPA-HQ-OAR-2024-0303-0029"}],"agency_name":"EPA","documents":[{"comment_count":null,"comment_start_date":null,"updated_at":"2026-04-01T10:02:13.974-04:00","comment_url":"https://www.regulations.gov/commenton/EPA-HQ-OAR-2024-0303-0085","allow_late_comments":false,"id":"EPA-HQ-OAR-2024-0303-0085","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":51,"id":"EPA-HQ-OAR-2024-0303","title":"National Emissions Standards for Hazardous Air Pollutants: Chemical Manufacturing Area Sources Technology Review"}],"document_number":"2026-06304","effective_on":"2026-04-01","end_page":16538,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/04/01/2026-06304.xml","html_url":"https://www.federalregister.gov/documents/2026/04/01/2026-06304/national-emission-standards-for-hazardous-air-pollutants-chemical-manufacturing-area-sources","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-06304?publication_date=2026-04-01","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-04-01/2026-06304/mods.xml","not_received_for_publication":null,"page_length":37,"page_views":{"count":1049,"last_updated":"2026-04-16 22:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-04-01/pdf/2026-06304.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-06304.pdf?1774961115","publication_date":"2026-04-01","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/04/01/2026-06304.txt","regulation_id_number_info":{"2060-AU73":{"issue":"202504","html_url":"https://www.federalregister.gov/regulations/2060-AU73/national-emission-standards-for-hazardous-air-pollutants-chemical-manufacturing-area-source-technolo","title":"National Emission Standards for Hazardous Air Pollutants: Chemical Manufacturing Area Source Technology Review","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=202504&RIN=2060-AU73&operation=OPERATION_EXPORT_XML","priority_category":"Substantive, Nonsignificant"}},"regulation_id_numbers":["2060-AU73"],"regulations_dot_gov_info":{"supporting_documents":[{"title":"Summary of Public Comments and Responses for National Emission Standards for Hazardous Air Pollutants for Chemical Manufacturing Area Sources","document_id":"EPA-HQ-OAR-2024-0303-0092"},{"title":"Documentation of EO 12866 Review of the CMAS NESHAP Technology Review Final Rulemaking","document_id":"EPA-HQ-OAR-2024-0303-0089"},{"title":"Documentation of Meetings with Industry Stakeholders - 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