{"data":{"id":"us/40-cfr-52.1371","jurisdiction":"us","citation":"40 CFR 52.1371","heading":"Classification of regions.","body":"The Montana Emergency Episode Avoidance Plan was revised with an August 2, 2004 submittal by the Governor. The August 2, 2004 Emergency Episode Avoidance Plan classified the Air Quality Control Regions (AQCR) as follows:\nAir quality control regions (AQCR) Pollutant\nParticulate matter Sulfur oxide Nitrogen dioxide Carbon monoxide Ozone\nBillings Intrastate AQCR 140 III III III III III\nGreat Falls Intrastate AQCR 141 III III III III III\nHelena Intrastate AQCR 142 III III III III III\nMiles City Intrastate AQCR 143 III III III III III\nMissoula Intrastate AQCR 144 III III III III III","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS","Subpart BB—Montana"],"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":"65775d4ffa48eb0c8d69e8b45f72ea78f0011a0b2aa7418486930a6455b54c30","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-52.1370","next":"us/40-cfr-52.1372"},"notice":"GroundRules: Original legal text. Not legal advice."}