GIS Map
RankingsMaineWorst air quality

Counties with the Worst Air Quality in Maine

The top 11 of 11 Maine counties on GIS Map, ranked by median Air Quality Index, counting only counties that host an EPA air monitor.

#CountyMedian AQI
1Cumberland County
37
2Hancock County
37
3Aroostook County
35
4Kennebec County
35
5Sagadahoc County
35
6Washington County
34
7York County
34
8Knox County
33
9Penobscot County
33
10Oxford County
32
11Androscoggin County
31

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 Maine”, https://gismap.land/rankings/maine/worst-air-quality-counties. Figures from EPA Air Quality Index annual summary (2024).

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