40 CFR 52.421 - Classification of regions.

Regulations last checked for updates: May 20, 2024

Title 40 - Protection of Environment last revised: May 16, 2024

§ 52.421 - Classification of regions.

The Delaware 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	Photochemical oxidants (hydrocarbons)
Metropolitan Philadelphia Interstate	I	I	III	I	I
Southern Delaware Intrastate	III	III	III	III	III

[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