Classification of regions.

§ 52.1371 Classification of regions. 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 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]