40 CFR 52.371 - Classification of regions.

Regulations most recently checked for updates: Aug 27, 2025

§ 52.371 - Classification of regions.

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

Air quality control region	Pollutant
Air quality control region	Particulate matter	Sulfur oxides	Nitrogen dioxide	Carbon monoxide	Ozone
New Jersey-New York-Connecticut Interstate	I	I	I	I	I
Hartford-New Haven-Springfield Interstate	I	I	III	I	I
Northwestern Intrastate	III	III	III	III	III
Eastern Intrastate	II	III	III	III	III

[37 FR 10855, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 84787, Dec. 23, 1980]