Union County, Oregon
AQI 22 · Good22
Median AQI
42
90th Percentile
70
Max AQI
181
Days with Data
Ranked #3 of 21 counties in Oregon (by median AQI, lower is better)
Monthly Median AQI — 2025
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22
Median AQI
42
90th Percentile
70
Max AQI
181
Days with Data
Ranked #3 of 21 counties in Oregon (by median AQI, lower is better)
Click a bar to view that month's details