EPA Air · stack tests by county and year
Air-emissions stack tests in Mason County, Michigan, 2025
- 6Stack 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 Mason County, Michigan 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 Mason County facility page.
Mason County, Michigan, 2025
Air-emissions stack tests in Mason County, other years
Air-emissions stack tests recorded in Mason County, Michigan, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-06-13 | DTE MICHIGAN POWER, LLC | Pass | State |
| 2025-05-22 | OCCIDENTAL CHEMICAL CORPORATION | Pass | State |
| 2025-05-22 | OCCIDENTAL CHEMICAL CORPORATION | Pass | State |
| 2025-05-21 | OCCIDENTAL CHEMICAL CORPORATION | Pass | State |
| 2025-05-01 | OCCIDENTAL CHEMICAL CORPORATION | Pass | State |
| 2025-05-01 | OCCIDENTAL CHEMICAL CORPORATION | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.