EPA Air · stack tests by county and year
Air-emissions stack tests in Box Elder County, Utah, 2025
- 5Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in Box Elder County, Utah during 2025. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the Box Elder County facility page.
Box Elder County, Utah, 2025
Air-emissions stack tests in Box Elder County, other years
Air-emissions stack tests recorded in Box Elder County, Utah, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-12-19 | NORTHRUP GRUMMAN SYSTEMS - PROMONTORY (FORMERLY ATK) | Pass | State |
| 2025-12-18 | NORTHRUP GRUMMAN SYSTEMS - PROMONTORY (FORMERLY ATK) | Pass | State |
| 2025-09-11 | NUCOR STEEL | Pass | State |
| 2025-09-05 | NUCOR STEEL | Pass | State |
| 2025-09-04 | NUCOR STEEL | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in Box Elder county, UT, in 2025. Stack tests recorded in 2025 for this county: 5.