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Counties with the Cleanest Air in Oregon

The top 21 of 21 Oregon counties on GIS Map, ranked by lowest median Air Quality Index, counting only counties that host an EPA air monitor.

#CountyMedian AQI
1Union County
23
2Wallowa County
23
3Wasco County
23
4Crook County
24
5Linn County
25
6Columbia County
26
7Jefferson County
26
8Baker County
28
9Lake County
28
10Josephine County
29
11Clackamas County
30
12Klamath County
33
13Washington County
33
14Marion County
35
15Multnomah County
35
16Umatilla County
38
17Deschutes County
39
18Jackson County
41
19Lane County
44
20Harney County
46
21Grant County
49

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

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