Counties with the Cleanest Air in Massachusetts
The top 13 of 13 Massachusetts counties on GIS Map, ranked by lowest median Air Quality Index, counting only counties that host an EPA air monitor.
| # | County | Median AQI |
|---|---|---|
| 1 | Hampshire County | 35 |
| 2 | Barnstable County | 36 |
| 3 | Franklin County | 36 |
| 4 | Suffolk County | 36 |
| 5 | Dukes County | 37 |
| 6 | Essex County | 37 |
| 7 | Hampden County | 37 |
| 8 | Middlesex County | 37 |
| 9 | Plymouth County | 37 |
| 10 | Worcester County | 37 |
| 11 | Berkshire County | 38 |
| 12 | Bristol County | 38 |
| 13 | Norfolk County | 39 |
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 Massachusetts”, https://gismap.land/rankings/massachusetts/cleanest-air-counties. Figures from EPA Air Quality Index annual summary (2024).
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