52.2421—Classification of regions.

The Virginia 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)
Eastern Tennessee-Southwestern Virginia Interstate	I	I	III	III	III
Valley of Virginia Intrastate	I	III	III	III	III
Central Virginia Intrastate	I	III	III	III	III
Northeastern Virginia Intrastate	IA	III	III	III	III
State Capital Intrastate	I	III	III	III	I
Hampton Roads Intrastate	I	II	III	III	I
National Capital Interstate	I	I	III	I	I

Code of Federal Regulations

[37 FR 15090, July 27, 1972, as amended at 39 FR 16347, May 8, 1974]