EPA Air · stack tests by county and year
Air-emissions stack tests in Yellowstone County, Montana, 2024
- 82Stack 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 2024. 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, 2024
Air-emissions stack tests in Yellowstone County, other years
Air-emissions stack tests recorded in Yellowstone County, Montana, 2024
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2024-12-22 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-12-16 | BILLINGS REFINERY | Pass | State |
| 2024-12-16 | BILLINGS REFINERY | Pass | State |
| 2024-12-13 | MONTANA SULPHUR & CHEMICAL | Pass | State |
| 2024-12-11 | PAR MONTANA BILLINGS REFINERY | Pass | State |
| 2024-12-04 | BILLINGS REFINERY | Pass | State |
| 2024-12-02 | BILLINGS REFINERY | Pass | State |
| 2024-12-02 | BILLINGS REFINERY | Pass | State |
| 2024-12-02 | BILLINGS REFINERY | Pass | State |
| 2024-12-02 | BILLINGS REFINERY | Fail | State |
| 2024-11-19 | PAR MONTANA BILLINGS REFINERY | Pass | State |
| 2024-11-07 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-11-07 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-11-07 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-11-07 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-11-06 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-11-06 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-11-06 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-11-04 | BILLINGS REFINERY | Pass | State |
| 2024-11-04 | BILLINGS REFINERY | Pass | State |
| 2024-11-04 | BILLINGS REFINERY | Pass | State |
| 2024-11-04 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-11-04 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-11-04 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-11-04 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-11-04 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-11-04 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-10-25 | YELLOWSTONE POWER PLANT — high-priority violation on file | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-07-31 | PAR MONTANA BILLINGS REFINERY | Pass | State |
| 2024-07-29 | YELLOWSTONE POWER PLANT — high-priority violation on file | Pass | State |
| 2024-07-29 | YELLOWSTONE POWER PLANT — high-priority violation on file | Pass | State |
| 2024-07-29 | YELLOWSTONE POWER PLANT — high-priority violation on file | Pass | State |
| 2024-07-29 | YELLOWSTONE POWER PLANT — high-priority violation on file | Pass | State |
| 2024-07-29 | YELLOWSTONE POWER PLANT — high-priority violation on file | Pass | State |
| 2024-07-29 | YELLOWSTONE POWER PLANT — high-priority violation on file | Pass | State |
| 2024-07-29 | YELLOWSTONE POWER PLANT — high-priority violation on file | Pass | State |
| 2024-07-22 | PAR MONTANA BILLINGS REFINERY | Pass | State |
| 2024-07-22 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-07-22 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-07-22 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-07-22 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-07-22 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-07-22 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-07-22 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-07-22 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-07-22 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-07-22 | YELLOWSTONE COUNTY GENERATING STATION | Pass | State |
| 2024-07-20 | PAR MONTANA BULK TERMINAL | Pass | State |
| 2024-07-19 | YELLOWSTONE POWER PLANT — high-priority violation on file | Pass | State |
| 2024-05-31 | PAR MONTANA BILLINGS REFINERY | Pass | State |
| 2024-05-31 | PAR MONTANA BILLINGS REFINERY | Pass | State |
| 2024-05-30 | PAR MONTANA BILLINGS REFINERY | Pass | State |
| 2024-05-21 | BILLINGS REFINERY | Pass | State |
| 2024-05-21 | BILLINGS REFINERY | Pass | State |
| 2024-05-21 | BILLINGS REFINERY | Pass | State |
| 2024-05-21 | BILLINGS REFINERY | Pass | State |
| 2024-05-10 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-05-09 | YELLOWSTONE POWER PLANT — high-priority violation on file | Pass | State |
| 2024-05-09 | YELLOWSTONE POWER PLANT — high-priority violation on file | Pass | State |
| 2024-04-29 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-04-24 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-04-24 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-04-14 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-04-01 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-04-01 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-03-24 | CHS INC REFINERY LAUREL | Pass | State |
| 2024-02-13 | PAR MONTANA BILLINGS REFINERY | Pass | State |
| 2024-01-28 | BILLINGS REFINERY | Pass | State |
| 2024-01-22 | BILLINGS REFINERY | Pass | State |
| 2024-01-19 | BILLINGS REFINERY | Pass | State |
| 2024-01-12 | BILLINGS REFINERY | Pass | State |
| 2024-01-12 | BILLINGS REFINERY | Pass | State |
| 2024-01-12 | BILLINGS REFINERY | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.