View all text of Subpart J [§ 52.470 - § 52.515]
§ 52.471 - Classification of regions.
The District of Columbia plan was evaluated on the basis of the following classifications:
Air quality control region | Pollutant | Particulate matter | Sulfur oxides | Nitrogen dioxide | Carbon monoxide | Ozone | National Capital Interstate | I | I | III | I | I |
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