EPA Air · stack tests by county and year
Air-emissions stack tests in Cook County, Illinois, 2026
- 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 Cook County, Illinois 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 Cook County facility page.
Cook County, Illinois, 2026
Air-emissions stack tests in Cook County, other years
Air-emissions stack tests recorded in Cook County, Illinois, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-05-19 | ADVOCATE ILLINOIS MASONIC MEDICAL CENTER | Pass | State |
| 2026-04-24 | WINNETKA ELECTRIC PLANT | Pass | State |
| 2026-04-24 | WINNETKA ELECTRIC PLANT | Pass | State |
| 2026-04-15 | ADVOCATE ILLINOIS MASONIC MEDICAL CENTER | Pass | State |
| 2026-03-04 | H KRAMER & CO — high-priority violation on file | Pass | State |
| 2026-02-04 | WR GRACE | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.