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RankingsWisconsinWorst air quality

Counties with the Worst Air Quality in Wisconsin

The top 25 of 29 Wisconsin counties on GIS Map, ranked by median Air Quality Index, counting only counties that host an EPA air monitor.

#CountyMedian AQI
1Milwaukee County
43
2Waukesha County
43
3Dane County
42
4Racine County
42
5Walworth County
42
6Kenosha County
41
7Rock County
41
8Sheboygan County
40
9Jefferson County
39
10Kewaunee County
39
11Manitowoc County
39
12Columbia County
38
13Dodge County
38
14Eau Claire County
38
15Fond du Lac County
38
16Brown County
37
17Door County
37
18Forest County
37
19La Crosse County
37
20Marathon County
37
21Outagamie County
37
22Ozaukee County
37
23Sauk County
37
24Vilas County
37
25Grant County
36

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

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