EPA Air · stack tests by county and year
Air-emissions stack tests in Mercer County, Kentucky, 2025
- 5Stack 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 Mercer County, Kentucky 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 Mercer County facility page.
Air-emissions stack tests in Mercer County, other years
What stands out
- Stack tests in Mercer County, Kentucky, fell from 8 in 2024, the previous year on file, to 5 in 2025.
- The county’s file for stack tests holds 10 years of events, from 2017 through 2026.
- Its 5 stack tests rank 7th of the 24 county cells in Kentucky for 2025.
- Its 5 stack tests are 2.4% of the 207 the state’s file holds for 2025.
Every line is computed by formula from the state’s stored file; nothing is estimated.
Air-emissions stack tests recorded in Mercer County, Kentucky, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-10-08 | CORNING INCORPORATED | Pass | State |
| 2025-09-18 | KY UTILITIES CO - BROWN STATION | Pass | State |
| 2025-04-30 | KY UTILITIES CO - BROWN STATION | Pass | State |
| 2025-04-29 | CORNING INCORPORATED | Pass | State |
| 2025-03-06 | KY UTILITIES CO - BROWN STATION | 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 public-records page covers Clean Air Act facilities in the EPA air register with stack tests in Mercer county, KY, for 2025. It lists 5 stack tests recorded in 2025.