1. Regulations
  2. title 40
  3. chapter I-i4
  4. part 52
  5. subpart BBB
  6. § 52.2721

View all text of Subpart BBB [§ 52.2720 - § 52.2732]

§ 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 RicoIAIAIIIIIIIII
[37 FR 10905, May 31, 1972]

CITE AS: 40 CFR 52.2721