GIS Map
RankingsUtahWorst air quality

Counties with the Worst Air Quality in Utah

The top 17 of 17 Utah counties on GIS Map, ranked by median Air Quality Index, counting only counties that host an EPA air monitor.

#CountyMedian AQI
1Salt Lake County
54
2Grand County
48
3Uintah County
48
4Box Elder County
47
5Duchesne County
47
6Utah County
47
7Davis County
46
8Tooele County
46
9Weber County
45
10Cache County
44
11Carbon County
44
12San Juan County
44
13Washington County
44
14Iron County
43
15Wasatch County
37
16Wayne County
11
17Garfield County
9

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

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