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

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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]