C.F.R. » Title 40 » CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY › SUBCHAPTER B—GRANTS AND OTHER FEDERAL ASSISTANCE › PART 49—INDIAN COUNTRY: AIR QUALITY PLANNING AND MANAGEMENT › Subpart M—Implementation Plans for Tribes—Region X

40 C.F.R. § 49.10885

Classification of regions for episode plans

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The air quality control region which encompasses the Reservation of the Stillaguamish Tribe is classified as follows for purposes of episode plans:

PollutantClassification
Carbon monoxideI
Nitrogen dioxideIII
OzoneI
Particulate matter (PM10)I
Sulfur oxidesIA