EPA Air · stack tests by county and year
Air-emissions stack tests in Carlton County, Minnesota, 2026
- 4Stack 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 Carlton County, Minnesota during 2026. 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 Carlton County facility page.
Carlton County, Minnesota, 2026
Air-emissions stack tests in Carlton County, other years
What stands out
- Stack tests in Carlton County, Minnesota, fell from 10 in 2025, the previous year on file, to 4 in 2026.
- The county’s file for stack tests holds 10 years of events, from 2017 through 2026.
- Its 4 stack tests rank 6th of the 14 county cells in Minnesota for 2026.
- Its 4 stack tests are 3.7% of the 108 the state’s file holds for 2026.
Every line is computed by formula from the state’s stored file; nothing is estimated.
Air-emissions stack tests recorded in Carlton County, Minnesota, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-09-03 | ULLAND BROTHERS INC | Pass | State |
| 2026-07-27 | SAPPI CLOQUET LLC | Pass | State |
| 2026-06-15 | SAPPI CLOQUET LLC | Pass | State |
| 2026-05-12 | SAPPI CLOQUET LLC | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.