{"data":{"id":"us/40-cfr-52.1127","jurisdiction":"us","citation":"40 CFR 52.1127","heading":"Attainment dates for national standards.","body":"The following table presents the latest dates by which the national standards are to be attained. The table reflects the new information presented in the approved Massachusetts plan.\nAir quality control region Pollutant\nSO 2 PM 10 NO 2 CO O 3\nPrimary Secondary\nAQCR 42: Hartford-New Haven-Springfield Interstate Area (See 40 CFR 81.26) (a) (b) (a) (a) (a) (c)\nAQCR 117: Berkshire Intrastat Area (See 40 CFR 81.141) (a) (b) (a) (a) (a) (c)\nAQCR 118: Central Mass Intrastate Area (See 4r0 CFR 81.142) (a) (b) (a) (a) (a) (d)\nAQCR 119: Metropolitan Boston Intrastate Area (See 40 CFR 81.19) (a) (b) (a) (a) (a) (d)\nAQCR 120: Metropolitan Providence Interstate Area (See 40 CFR 81.31) (a) (b) (a) (a) (a) (d)\nAQCR 121: Merrimack Valley-Southern NH Interstate Area (See 40 CFR 81.81) (a) (b) (a) (a) (a) (d)\na. Air quality presently below primary standards or area is unclassifiable.\nb. Air quality levels presently secondary standards or area is unclassifiable.\nc. December 31, 2003.\nd. November 15, 2007.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS","Subpart W—Massachusetts"],"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":"d406a963219cb500f50e1f9aaefe5e002b4014dc0d1951c0bbe14679d2e6f202","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-52.1126","next":"us/40-cfr-52.1128"},"notice":"GroundRules: Original legal text. Not legal advice."}