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