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RankingsMarylandCleanest air

Counties with the Cleanest Air in Maryland

The top 15 of 15 Maryland counties on GIS Map, ranked by lowest median Air Quality Index, counting only counties that host an EPA air monitor.

#CountyMedian AQI
1Howard County
32
2Garrett County
39
3Prince George's County
39
4Anne Arundel County
40
5Charles County
40
6Dorchester County
40
7Kent County
40
8Montgomery County
40
9Washington County
40
10Calvert County
41
11Carroll County
42
12Harford County
42
13Frederick County
43
14Cecil County
44
15Baltimore County
45

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

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