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.
What this page shows
This page covers Clean Air Act facilities in the EPA air register and stack tests in Yellowstone county, MT, in 2023. It lists 51 stack tests recorded in 2023.