{"data":{"id":"us/40-cfr-52.321","jurisdiction":"us","citation":"40 CFR 52.321","heading":"Classification of regions.","body":"The revised Denver Emergency Episode Plan, adopted by the State of Colorado February 28, 1996, was submitted by the Governor of Colorado with a September 16, 1997 letter.\nAir quality control region Pollutant\nParticulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone\nPawnee Intrastate I III III III III\nMetropolitan Denver Intrastate I III III I I\nComanche Intrastate III III III III III\nSan Isabel Intrastate I III III III III\nSan Luis Intrastate III III III III III\nFour Corners Interstate IA IA III III III\nGrand Mesa Intrastate III III III III III\nYampa Intrastate 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 G—Colorado"],"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":"b47733e3815ed277b4201667b84c53a2ffc5929fb455207c93037bbbf2fa329e","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-52.320","next":"us/40-cfr-52.322"},"notice":"GroundRules: Original legal text. Not legal advice."}