Counties with the Cleanest Air in Pennsylvania
The top 25 of 38 Pennsylvania counties on GIS Map, ranked by lowest median Air Quality Index, counting only counties that host an EPA air monitor.
| # | County | Median AQI |
|---|---|---|
| 1 | Lawrence County | 24 |
| 2 | Susquehanna County | 25 |
| 3 | Wyoming County | 26 |
| 4 | Elk County | 34 |
| 5 | Franklin County | 35 |
| 6 | Monroe County | 35 |
| 7 | Bucks County | 36 |
| 8 | Cumberland County | 36 |
| 9 | Tioga County | 36 |
| 10 | Blair County | 37 |
| 11 | Bradford County | 37 |
| 12 | Indiana County | 37 |
| 13 | Somerset County | 37 |
| 14 | Erie County | 38 |
| 15 | Greene County | 38 |
| 16 | Lehigh County | 39 |
| 17 | Lycoming County | 39 |
| 18 | Northampton County | 39 |
| 19 | Westmoreland County | 39 |
| 20 | Centre County | 40 |
| 21 | Lackawanna County | 40 |
| 22 | Mercer County | 40 |
| 23 | Montgomery County | 40 |
| 24 | Armstrong County | 41 |
| 25 | Chester County | 41 |
Source: EPA Air Quality Index annual summary (2024). All counties with data are ranked. Estimates carry margins of error.
Citing this page: GIS Map, “Counties with the Cleanest Air in Pennsylvania”, https://gismap.land/rankings/pennsylvania/cleanest-air-counties. Figures from EPA Air Quality Index annual summary (2024).
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