EPA Air · stack tests by county and year
Air-emissions stack tests in Henderson County, Kentucky, 2026
- 4Stack 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 Henderson County, Kentucky 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 Henderson County facility page.
Henderson County, Kentucky, 2026
Air-emissions stack tests in Henderson County, other years
What stands out
- Stack tests in Henderson County, Kentucky, fell from 8 in 2025, the previous year on file, to 4 in 2026.
- The county’s file for stack tests holds 10 years of events, from 2017 through 2026.
- Its 4 stack tests rank 4th of the 10 county cells in Kentucky for 2026.
- Its 4 stack tests are 4% of the 101 the state’s file holds for 2026.
Every line is computed by formula from the state’s stored file; nothing is estimated.
Air-emissions stack tests recorded in Henderson County, Kentucky, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-04-23 | CENTURY ALUMINUM SEBREE LLC | Pass | State |
| 2026-04-20 | CENTURY ALUMINUM SEBREE LLC | Pass | State |
| 2026-03-11 | CENTURY ALUMINUM SEBREE LLC | Pass | State |
| 2026-01-13 | CENTURY ALUMINUM SEBREE LLC | 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 Henderson county, KY, for 2026. It lists 4 stack tests recorded in 2026.