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RankingsIowaCleanest air

Counties with the Cleanest Air in Iowa

The top 14 of 14 Iowa counties on GIS Map, ranked by lowest median Air Quality Index, counting only counties that host an EPA air monitor.

#CountyMedian AQI
1Muscatine County
38
2Johnson County
39
3Bremer County
40
4Harrison County
42
5Montgomery County
42
6Palo Alto County
42
7Pottawattamie County
42
8Woodbury County
43
9Linn County
44
10Polk County
45
11Clinton County
46
12Scott County
46
13Van Buren County
46
14Black Hawk County
47

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

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