CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS (Parts 50–99) > PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS > SUBPART BB—Montana (§52.1370 to §52.1393) > 52.1371—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 Nitrogendioxide Carbonmonoxide 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

Code of Federal Regulations

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