52.1071—Classification of regions.

The Maryland plans were 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	Ozone
Cumberland-Keyser Interstate	I	I	III	III	III
Central Maryland Intrastate	II	II	III	III	III
Metropolitan Baltimore Intrastate	I	I	I	I	I
National Capital Interstate	I	I	III	I	I
Southern Maryland Intrastate	III	III	III	III	III
Eastern Shore Intrastate	II	III	III	III	III

Code of Federal Regulations

[37 FR 10870, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 53475, Aug. 12, 1980]