C.F.R. » Title 40 » CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY › SUBCHAPTER C—AIR PROGRAMS › PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS › Subpart W—Massachusetts

40 C.F.R. § 52.1121

Classification of regions

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The Massachusetts plan was evaluated on the basis of the following classifications:

Air quality control regionPollutant
Particulate matterSulfur oxidesNitrogen dioxideCarbon monoxideOzone
Metropolitan Boston IntrastateIIIIIII
Merrimack Valley-Southern New Hampshire InterstateIIIIIIIIIII
Metropolitan Providence InterstateIIIIIIIIIII
Central Massachusetts IntrastateIIIIIIIIIIII
Hartford-New Haven-Springfield InterstateIIIIIII
Berkshire IntrastateIIIIIIIIIIIIII
[37 FR 10872, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 61303, Sept. 16, 1980; 84 FR 29383, June 24, 2019]