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RankingsOhioCleanest air

Counties with the Cleanest Air in Ohio

The top 25 of 37 Ohio counties on GIS Map, ranked by lowest median Air Quality Index, counting only counties that host an EPA air monitor.

#CountyMedian AQI
1Columbiana County
12
2Athens County
28
3Belmont County
32
4Clermont County
39
5Lorain County
39
6Noble County
40
7Scioto County
40
8Ashtabula County
41
9Geauga County
41
10Knox County
41
11Lake County
41
12Washington County
41
13Wood County
41
14Allen County
42
15Delaware County
42
16Licking County
42
17Greene County
43
18Lawrence County
43
19Miami County
43
20Portage County
43
21Warren County
43
22Clinton County
44
23Madison County
44
24Mahoning County
44
25Medina County
44

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

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