{"data":{"id":"us/40-cfr-63.1177","jurisdiction":"us","citation":"40 CFR 63.1177","heading":"Am I subject to this subpart?","body":"You are subject to this subpart if you own or operate an existing, new, or reconstructed mineral wool production facility that is located at a plant site that is a major source of hazardous air pollutant (HAP) emissions, meaning the plant emits or has the potential to emit any single HAP at a rate of 9.07 megagrams (10 tons) or more per year or any combination of HAPs at a rate of 22.68 megagrams (25 tons) or more per year.","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 DDD—National Emission Standards for Hazardous Air Pollutants for Mineral Wool Production"],"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":"5ec1f63f307fd730c404cf54de7bb29b2eadb194c5ab95cbb690ea4b770a28bb","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-63.1176","next":"us/40-cfr-63.1178"},"notice":"GroundRules: Original legal text. Not legal advice."}