{"data":{"id":"us/40-cfr-table-1-to-subpart-xx-of-part-63","jurisdiction":"us","citation":"40 CFR Table 1 to Subpart XX of Part 63","heading":"Table 1 to Subpart XX of Part 63—Hazardous Air Pollutants","body":"Hazardous air pollutant CAS No.\nBenzene 71432\n1,3-Butadiene 106990\nCumene 98828\nEthyl benzene 100414\nHexane 110543\nNaphthalene 91203\nStyrene 100425\nToluene 108883\no-Xylene 95476\nm-Xylene 108383\np-Xylene 106423","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 XX—National Emission Standards for Ethylene Manufacturing Process Units: Heat Exchange Systems and Waste Operations"],"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":"7f546b4db8a4d925d615678d3369114ab6a6667a73596fa3976e1b835628994b","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-63.1097","next":"us/40-cfr-table-2-to-subpart-xx-of-part-63"},"notice":"GroundRules: Original legal text. Not legal advice."}