1. Regulations
  2. title 40
  3. chapter I-i2
  4. part 52
  5. subpart I
  6. § 52.421

View all text of Subpart I [§ 52.420 - § 52.465]

§ 52.421 - Classification of regions.

The Delaware 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) Metropolitan Philadelphia InterstateIIIIIII Southern Delaware IntrastateIIIIIIIIIIIIIII
[37 FR 10856, May 31, 1972, as amended at 39 FR 16345, May 8, 1974]

AUTHORITY: 42 U.S.C. 7401

CITE AS: 40 CFR 52.421