40 CFR § 52.1121
Classification of regions
June 9, 2020
The Massachusetts plan was evaluated on the basis of the following classifications:
Open Table
| 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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