EPA Air · stack tests by county and year
Air-emissions stack tests in Mahoning County, Ohio, 2025
- 23Stack 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 Mahoning County, Ohio 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 Mahoning County facility page.
Mahoning County, Ohio, 2025
- Inspections 12
Air-emissions stack tests in Mahoning County, other years
What stands out
- Stack tests in Mahoning County, Ohio, fell from 27 in 2024, the previous year on file, to 23 in 2025.
- The county’s file for stack tests holds 10 years of events, from 2017 through 2026.
- Its 23 stack tests rank 23rd of the 55 county cells in Ohio for 2025.
- Its 23 stack tests are 1% of the 2,217 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 Mahoning County, Ohio, 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 Mahoning county, OH, in 2025. It lists 23 stack tests recorded in 2025.