{"data":{"id":"us/40-cfr-52.1621","jurisdiction":"us","citation":"40 CFR 52.1621","heading":"Classification of regions.","body":"The New Mexico plan was evaluated on the basis of the following classifications:\nAir quality control region Pollutant\nParticulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone\nAlbuquerque-Mid-Rio Grande Intrastate I III III III I\nNew Mexico Southern Border Intrastate IA IA III III III\nEl Paso-Las Cruces-Alamogordo Interstate I IA III I I\nFour Corners Interstate IA IA III III III\nNortheastern Plains Intrastate III III III III III\nPecos-Permian Basin Intrastate III III III III III\nSouthwestern Mountains-Augustine Plains Intrastate III III III III III\nUpper Rio Grande Valley 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 GG—New Mexico"],"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":"a96d0d4ad447b485b4ed1baeb8a11d1ac3274951b3493ee9190ab456c740d9f5","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-52.1620","next":"us/40-cfr-52.1622"},"notice":"GroundRules: Original legal text. Not legal advice."}