EPA Air · stack tests by county and year
Air-emissions stack tests in Jefferson County, Kentucky, 2025
- 50Stack 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 Jefferson 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 Jefferson County facility page.
Jefferson County, Kentucky, 2025
Air-emissions stack tests in Jefferson County, other years
What stands out
- Stack tests in Jefferson County, Kentucky, rose from 44 in 2024, the previous year on file, to 50 in 2025.
- The county’s file for stack tests holds 10 years of events, from 2017 through 2026.
- Its 50 stack tests rank 1st of the 24 county cells in Kentucky for 2025.
- Its 50 stack tests are 24.2% 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 Jefferson County, Kentucky, 2025
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 Jefferson county, KY, in 2025. It lists 49 stack tests recorded in 2025.