40 CFR § 52.2071
Classification of regions
June 9, 2020
The Rhode Island 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 Providence Interstate | I | I | III | I | I |
[37 FR 10891, May 31, 1972, as amended at 38 FR 34325, Dec. 13, 1973; 39 FR 16347, May 8, 1974; 46 FR 25460, May 7, 1981]
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