Title 40

SECTION 52.2721

52.2721 Classification of regions.

§ 52.2721 Classification of regions.

The Puerto Rico plan was evaluated on the basis of the following classifications.

Air quality control region Pollutant
Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Photochemical oxidants (hydrocarbons)
Puerto Rico IA IA III III III
[37 FR 10905, May 31, 1972]