Federal regulations · Through 2026-08-25 · Newer source version available

40 CFR 52.1371: Classification of regions.

Where this section sits in the code

Title 40—Protection of Environment
CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
SUBCHAPTER C—AIR PROGRAMS
PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS
Subpart BB—Montana

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

Collected 2026-08-27T02:26:04Z. Source file · JSON

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