{"data":{"id":"us/40-cfr-52.1771","jurisdiction":"us","citation":"40 CFR 52.1771","heading":"Classification of regions.","body":"The North Carolina plan was evaluated on the basis of the following classifications:\nAir quality control region Pollutant\nParticulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Photochemical oxidants (hydrocarbons)\nWestern Mountain Intrastate I III III III III\nEastern Mountain Intrastate I III III III III\nMetropolitan Charlotte Interstate I II III III I\nNorthern Piedmont Intrastate I III III III III\nEastern Piedmont Intrastate I III III III III\nNorthern Coastal Intrastate I III III III III\nSouthern Coastal Intrastate II III III III III\nSandhills Intrastate II 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 II—North Carolina"],"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":"2718fb566973c29a2c4396e3018f84ee74f456cc77cf61581ffff07b8bf73e96","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-52.1770","next":"us/40-cfr-52.1772"},"notice":"GroundRules: Original legal text. Not legal advice."}