Classification of regions.

  1. Law
  2. CFR 40
  3. Protection of Environment
  4. Environmental Protection Agency
  5. Air Programs
  6. Approval and Promulgation of Implementation Plans
  7. Massachusetts
  8. Classification of regions.

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§ 52.1121 Classification of regions.

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

Air quality control region Pollutant
Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone
Metropolitan Boston Intrastate I I III I I
Merrimack Valley-Southern New Hampshire Interstate I I III III III
Metropolitan Providence Interstate I I III III III
Central Massachusetts Intrastate I II III III III
Hartford-New Haven-Springfield Interstate I I III I I
Berkshire 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; 84 FR 29383, June 24, 2019]


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