EPA Air · stack tests by state and year
Air-emissions stack tests in Pennsylvania, 2026
- 501Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every stack test below was recorded against a source in Pennsylvania during 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Pennsylvania, 2026
- Susquehanna County 117
- Lycoming County 36
- Bradford County 30
- Washington County 29
- Greene County 24
- Philadelphia County 22
- Tioga County 22
- Armstrong County 17
- Wyoming County 13
- Allegheny County 13
- Butler County 12
- Potter County 11
- Mercer County 11
- Westmoreland County 11
- Fayette County 9
- Lawrence County 9
- Montgomery County 7
- Elk County 6
- Lancaster County 6
- York County 6
- Luzerne County 6
- Indiana County 5
- Delaware County 5
- Venango County 5
- Franklin County 5
- Northampton County 5
- Beaver County 4
- Crawford County 4
- Schuylkill County 4
- Dauphin County 4
- Centre County 3
- Jefferson County 3
- Bucks County 3
- Somerset County 3
- Adams County 3
- Bedford County 3
- Berks County 3
Pennsylvania, other years
Air-emissions stack tests recorded in Pennsylvania, 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-01-02 | EXPAND OPERATING LLC/LIGHTCAP BRA PAD | FORKSVILLE, Bradford, PA | Pass | State |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.