GIS Map
RankingsArizonaWorst air quality

Counties with the Worst Air Quality in Arizona

The top 13 of 13 Arizona counties on GIS Map, ranked by median Air Quality Index, counting only counties that host an EPA air monitor.

#CountyMedian AQI
1Maricopa County
77
2Pinal County
77
3Pima County
56
4Gila County
50
5Cochise County
48
6La Paz County
47
7Yavapai County
47
8Yuma County
47
9Coconino County
46
10Santa Cruz County
43
11Mohave County
19
12Apache County
14
13Navajo County
13

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

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