{"data":{"id":"us/40-cfr-52.1521","jurisdiction":"us","citation":"40 CFR 52.1521","heading":"Classification of regions.","body":"The New Hampshire plan was evaluated on the basis of the following classifications:\nAir quality control region Pollutant\nParticulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone\nAndroscoggin Valley Interstate IA III III III III\nCentral New Hampshire Intrastate III III III III III\nMerrimack Valley—Southern New Hampshire Interstate I III III III I","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS","Subpart EE—New Hampshire"],"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":"897093953d6e41d0a79476cb53272981bcb18b7e1d21382582894bebf713e99f","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-52.1520","next":"us/40-cfr-52.1522"},"notice":"GroundRules: Original legal text. Not legal advice."}