Umatilla County, Oregon
AQI 39 · Good39
Median AQI
57
90th Percentile
79
Max AQI
181
Days with Data
Ranked #19 of 21 counties in Oregon (by median AQI, lower is better)
Monthly Median AQI — 2025
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39
Median AQI
57
90th Percentile
79
Max AQI
181
Days with Data
Ranked #19 of 21 counties in Oregon (by median AQI, lower is better)
Click a bar to view that month's details