C.F.R. » Title 40 » CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY › SUBCHAPTER C—AIR PROGRAMS › PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS › Subpart WW—Washington

40 C.F.R. § 52.2471

Classification of regions

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

Air quality control regionPollutant
Particulate matterSulfur oxidesNitrogen
dioxide		Carbon
monoxide		Ozone
Eastern Washington-Northern Idaho InterstateIIAIIIIIIIII
Northern Washington IntrastateIIIIIIIIIIIIII
Olympic-Northwest Washington IntrastateIIIIIIIIIIIII
Portland InterstateIIAIIIIIIIII
Puget Sound IntrastateIIAIIIIIII
South Central Washington IntrastateIIIIIIIIIIIII
[81 FR 1131, Jan. 11, 2016]