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Title 40 Part 52 → Subpart J → §52.471

Title 40 → Chapter I → Subchapter C → Part 52 → Subpart J → §52.471

Electronic Code of Federal Regulations e-CFR

Title 40 Part 52 → Subpart J → §52.471

e-CFR data is current as of January 24, 2020

Title 40Chapter ISubchapter CPart 52Subpart J → §52.471


Title 40: Protection of Environment
PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS
Subpart J—District of Columbia


§52.471   Classification of regions.

The District of Columbia plan was evaluated on the basis of the following classifications:

Air quality control regionPollutant
Particulate matterSulfur oxidesNitrogen dioxideCarbon monoxideOzone
National Capital InterstateIIIIIII

[37 FR 10857, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 46 FR 61263, Dec. 16, 1981]