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RankingsMaineCleanest air

Counties with the Cleanest Air in Maine

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

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

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

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