EPA Air · stack tests by state, industry and year
National security and international affairs (NAICS 9281): stack tests in Montana, 2025
- 3Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row is one stack test recorded during 2025 at a Montana source whose primary industry code is NAICS 9281. A facility filing more than one industry code is counted under the first one on its record.
National security and international affairs (NAICS 9281) in Montana, other years
- 2022 3
Other industries in Montana, 2025
- Pipeline transportation (NAICS 4862) 54
- Petroleum and coal products manufacturing (NAICS 3241) 42
- Utilities (NAICS 2211) 42
- Oil and gas extraction (NAICS 2111) 12
- Food manufacturing (NAICS 3113) 5
- Primary metal manufacturing (NAICS 3314) 3
Air-emissions stack tests recorded in Montana, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-03-17 | MALMSTROM AFB | GREAT FALLS, Cascade, MT | Pass | State |
| 2025-03-17 | MALMSTROM AFB | GREAT FALLS, Cascade, MT | Pass | State |
| 2025-03-17 | MALMSTROM AFB | GREAT FALLS, Cascade, MT | Pass | State |
Primary NAICS code as filed on the facility record; dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.