{"data":{"id":"us/40-cfr-63.9881","jurisdiction":"us","citation":"40 CFR 63.9881","heading":"Am I subject to this subpart?","body":"You are subject to this subpart if you own or operate a primary magnesium refinery that is (or is part of) a major source of hazardous air pollutant (HAP) emissions. Your primary magnesium refinery is a major source of HAP if it emits or has the potential to emit any single HAP at a rate of 10 tons or more per year or any combination of HAP at a rate of 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 TTTTT—National Emissions Standards for Hazardous Air Pollutants for Primary Magnesium Refining"],"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":"36d7da67310eabe913342dd7348a42f0bf5e806482c29d6fae58b04fb45eb5de","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-63.9880","next":"us/40-cfr-63.9882"},"notice":"GroundRules: Original legal text. Not legal advice."}