EPA Air · stack tests by state, industry and year
Nonmetallic mineral product manufacturing (NAICS 3273): stack tests in Montana, 2026
- 5Stack 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 2026 at a Montana source whose primary industry code is NAICS 3273. A facility filing more than one industry code is counted under the first one on its record.
Nonmetallic mineral product manufacturing (NAICS 3273) in Montana, other years
Other industries in Montana, 2026
- Utilities (NAICS 2211) 31
- Petroleum and coal products manufacturing (NAICS 3241) 29
- Pipeline transportation (NAICS 4862) 17
- Mining support (NAICS 2131) 4
- Merchant wholesalers, nondurable goods (NAICS 4247) 3
Air-emissions stack tests recorded in Montana, 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-07-09 | ASH GROVE CEMENT | CLANCY, Jefferson, MT | Pass | State |
| 2026-07-09 | ASH GROVE CEMENT | CLANCY, Jefferson, MT | Pass | State |
| 2026-07-09 | ASH GROVE CEMENT | CLANCY, Jefferson, MT | Pass | State |
| 2026-07-09 | ASH GROVE CEMENT | CLANCY, Jefferson, MT | Pass | State |
| 2026-03-09 | TRIDENT | THREE FORKS, Gallatin, 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.