{"data":{"id":"us/40-cfr-63.61","jurisdiction":"us","citation":"40 CFR 63.61","heading":"Deletion of methyl ethyl ketone from the list of hazardous air pollutants.","body":"The substance methyl ethyl ketone (MEK, 2-Butanone) (CAS Number 78-93-3) is deleted from the list of hazardous air pollutants established by 42 U.S.C. 7412(b)(1).","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 63—NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES","Subpart C—List of Hazardous Air Pollutants, Petitions Process, Lesser Quantity Designations, Source Category List"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"5c61a3409de0016cf0008301d306001ac441e044804fa29d306fc1e6b674d1ca","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-63.60","next":"us/40-cfr-63.62"},"notice":"GroundRules: Original legal text. Not legal advice."}