40 CFR § 52.1521 - Classification of regions.

§ 52.1521 Classification of regions.

The New Hampshire plan was evaluated on the basis of the following classifications:

Air quality control region Pollutant
Particulate matter Sulfur oxides Nitrogen
dioxide
Carbon
monoxide
Ozone
Androscoggin Valley Interstate IA III III III III
Central New Hampshire Intrastate III III III III III
Merrimack Valley - Southern New Hampshire Interstate I III III III I
[37 FR 10879, May 31, 1972, as amended at 45 FR 24876, Apr. 11, 1980; 80 FR 78141, Dec. 16, 2015; 81 FR 44554, July 8, 2016]