{"data":{"id":"us/40-cfr-52.1071","jurisdiction":"us","citation":"40 CFR 52.1071","heading":"Classification of regions.","body":"The Maryland plans were evaluated on the basis of the following classifications:\nAir quality control region Pollutant\nParticulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone\nCumberland-Keyser Interstate I I III III III\nCentral Maryland Intrastate II II III III III\nMetropolitan Baltimore Intrastate I I I I I\nNational Capital Interstate I I III I I\nSouthern Maryland Intrastate III III III III III\nEastern Shore 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 V—Maryland"],"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":"3c8407de39b3e8a7d3aec3434e8d56bc9931cb66c470c347b4db4358f08531fb","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-52.1070","next":"us/40-cfr-52.1072"},"notice":"GroundRules: Original legal text. Not legal advice."}