EPA Air · stack tests by county and year
Air-emissions stack tests in Yellowstone County, Montana, 2023
- 51Stack 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 Yellowstone County, Montana during 2023. 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 Yellowstone County facility page.
Yellowstone County, Montana, 2023
Air-emissions stack tests in Yellowstone County, other years
Air-emissions stack tests recorded in Yellowstone County, Montana, 2023
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2023-11-16 | BILLINGS REFINERY | Pass | State |
| 2023-11-02 | BILLINGS REFINERY | Pass | State |
| 2023-11-02 | MONTANA SULPHUR & CHEMICAL | Pass | State |
| 2023-11-01 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-11-01 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-11-01 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-11-01 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-11-01 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-11-01 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-10-12 | PAR MONTANA BILLINGS REFINERY | Pass | State |
| 2023-10-06 | BILLINGS REFINERY | Pass | State |
| 2023-10-05 | YELLOWSTONE POWER PLANT — high-priority violation on file | Pass | State |
| 2023-09-15 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-09-15 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-09-15 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-09-15 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-08-21 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-08-21 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-08-21 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-08-21 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-08-21 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-08-15 | MONTANA SULPHUR & CHEMICAL | Pass | State |
| 2023-08-15 | MONTANA SULPHUR & CHEMICAL | Pass | State |
| 2023-08-15 | MONTANA SULPHUR & CHEMICAL | Pass | State |
| 2023-07-25 | PAR MONTANA BILLINGS REFINERY | Pass | State |
| 2023-07-21 | YELLOWSTONE POWER PLANT — high-priority violation on file | Pass | State |
| 2023-06-22 | PAR MONTANA BILLINGS REFINERY | Pass | State |
| 2023-06-22 | PAR MONTANA BILLINGS REFINERY | Pass | State |
| 2023-06-22 | PAR MONTANA BILLINGS REFINERY | Pass | State |
| 2023-06-16 | PAR MONTANA BULK TERMINAL | Pass | State |
| 2023-04-21 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-04-21 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-04-19 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-04-19 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-03-21 | YELLOWSTONE POWER PLANT — high-priority violation on file | Pass | State |
| 2023-03-20 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-03-20 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-03-20 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-03-17 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-03-17 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-03-17 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-03-17 | CHS INC REFINERY LAUREL | Pass | State |
| 2023-03-10 | YELLOWSTONE POWER PLANT — high-priority violation on file | Pass | State |
| 2023-02-09 | WESTERN SUGAR COOPERATIVE — high-priority violation on file | Pass | State |
| 2023-02-09 | WESTERN SUGAR COOPERATIVE — high-priority violation on file | Pass | State |
| 2023-02-07 | BILLINGS REFINERY | Pass | State |
| 2023-01-25 | MONTANA SULPHUR & CHEMICAL | Pass | State |
| 2023-01-23 | YELLOWSTONE POWER PLANT — high-priority violation on file | Pass | State |
| 2023-01-05 | BILLINGS REFINERY | Pass | State |
| 2023-01-05 | BILLINGS REFINERY | Pass | State |
| 2023-01-05 | PAR MONTANA BILLINGS REFINERY | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.