EPA Air · stack tests by county and year
Air-emissions stack tests in Gibson County, Indiana, 2025
- 7Stack 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 Gibson County, Indiana 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 Gibson County facility page.
Air-emissions stack tests in Gibson County, other years
What stands out
- Stack tests in Gibson County, Indiana, fell from 16 in 2024, the previous year on file, to 7 in 2025.
- The county’s file for stack tests holds 10 years of events, from 2017 through 2026.
- Its 7 stack tests rank 50th of the 64 county cells in Indiana for 2025.
- Its 7 stack tests are 0.4% of the 1,621 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 Gibson County, Indiana, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-10-15 | DUKE ENERGY INDIANA LLC - GIBSON GENERATING STATION | Pass | State |
| 2025-08-05 | DUKE ENERGY INDIANA LLC - GIBSON GENERATING STATION | Pass | State |
| 2025-07-15 | DUKE ENERGY INDIANA LLC - GIBSON GENERATING STATION | Pass | State |
| 2025-07-10 | DUKE ENERGY INDIANA LLC - GIBSON GENERATING STATION | Pass | State |
| 2025-02-13 | DUKE ENERGY INDIANA LLC - GIBSON GENERATING STATION | Pass | State |
| 2025-02-05 | DUKE ENERGY INDIANA LLC - GIBSON GENERATING STATION | Pass | State |
| 2025-01-21 | DUKE ENERGY INDIANA LLC - GIBSON GENERATING 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 page covers Clean Air Act facilities in the EPA air register with stack tests in Gibson county, IN, for 2025. The stack tests recorded in 2025 total 7.