40 C.F.R. § 52.1371

Classification of regions

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The Montana Emergency Episode Avoidance Plan was revised with an August 2, 2004 submittal by the Governor. The August 2, 2004 Emergency Episode Avoidance Plan classified the Air Quality Control Regions (AQCR) as follows:

Air quality control regions (AQCR)	Pollutant
Air quality control regions (AQCR)	Particulate matter	Sulfur oxide	Nitrogen dioxide	Carbon monoxide	Ozone
Billings Intrastate AQCR 140	III	III	III	III	III
Great Falls Intrastate AQCR 141	III	III	III	III	III
Helena Intrastate AQCR 142	III	III	III	III	III
Miles City Intrastate AQCR 143	III	III	III	III	III
Missoula Intrastate AQCR 144	III	III	III	III	III

[64 FR 68038, Dec. 6, 1999, as amended at 66 FR 31550, June 12, 2001; 71 FR 21, Jan. 3, 2006]