{"abstract":"The U.S. Environmental Protection Agency (EPA) is finalizing the residual risk and technology review (RTR) conducted for the National Emission Standards for Hazardous Air Pollutants (NESHAP) from Hazardous Waste Combustors (HWC). Specifically, the EPA is finalizing that risks due to emissions of hazardous air pollutants (HAP) from this source category are adequately addressed by the existing standards; that the NESHAP provides an ample margin of safety to protect public health; and that no developments in practices, processes, or control technologies necessitate revision of the standards. In addition, the EPA is promulgating emission standards for hydrogen fluoride (HF) and hydrogen cyanide (HCN) emissions from major source HWC incinerators, cement kilns, solid fuel boilers, and liquid fuel boilers under Clean Air Act (CAA) sections 112(d)(2) and (3) and 112(h). These final amendments also include work practice standards under CAA section 112(h) for periods of startup, shutdown, and malfunction (SSM); new electronic reporting provisions and requirements; provisions allowing States to choose to exempt area source HWCs from certain permitting requirements; and certain typographical and technical corrections and clarifications.","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/2026/06/03/2026-11047.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"63","title":40}],"citation":"91 FR 33484","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This final rule is effective on June 3, 2026. The incorporation by reference of certain material listed in the rule was approved by the Director of the Federal Register as of September 8, 2020.","disposition_notes":null,"docket_ids":["EPA-HQ-OAR-2004-0022","FRL-10654-02-OAR"],"dockets":[{"supporting_documents":[{"title":"HWC NESHAP 2023 Section 114 Questionnaire Memorandum","document_id":"EPA-HQ-OAR-2004-0022-0651"},{"title":"Proposed Red Line Strike Out for 40 CFR Subpart EEE HWC NESHAP Malfunction and Electronic Reporting Amendments","document_id":"EPA-HQ-OAR-2004-0022-0644"},{"title":"Revised Response to Comments on April 20, 2004 Hazardous Waste Combustors (HWC) Maximum Achievable Control Technology (MACT) Proposed Rule; Volume III: Compliance Issues","document_id":"EPA-HQ-OAR-2004-0022-0640"},{"title":"Revised Technical Support Document for Hazardous Waste Combustor (HWC) Maximum Achievable Control Technology (MACT) Standards; Volume III: Selection of Maximum Achievable Control Technology (MACT) Standards (Part 2 of 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