Classification of regions.

§ 52.1121 Classification of regions.

The Massachusetts plan was evaluated on the basis of the following classifications:

Air quality control region Pollutant
Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone
Metropolitan Boston IntrastateIIIIIII
Merrimack Valley-Southern New Hampshire InterstateIIIIIIIIIII
Metropolitan Providence InterstateIIIIIIIIIII
Central Massachusetts IntrastateIIIIIIIIIIII
Hartford-New Haven-Springfield InterstateIIIIIII
Berkshire IntrastateIIIIIIIIIIIIII
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