The Massachusetts plan was evaluated on the basis of the following classifications: ----------------------------------------------------------------------------------------------------------------
Pollutant
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Air quality control region Particulate Sulfur Nitrogen Carbon
matter oxides dioxide monoxide Ozone----------------------------------------------------------------------------------------------------------------Metropolitan Boston Intrastate............................ I I III I I
Merrimack Valley-Southern New Hampshire Interstate........ I I III III IIIMetropolitan Providence Interstate........................ I I III III IIICentral Massachusetts Intrastate.......................... I II III III IIIHartford-New Haven-Springfield Interstate................. I I III I IBerkshire Intrastate...................................... II III III III III---------------------------------------------------------------------------------------------------------------- [37 FR 10872, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 61303, Sept. 16, 1980] Sec. 52.1122 [Reserved]