40 CFR § 52.1371
Classification of regions
June 9, 2020
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:
Open Table
| 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]
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