Columbia County, Oregon
AQI 25 · Good25
Median AQI
40
90th Percentile
69
Max AQI
181
Days with Data
Ranked #10 of 21 counties in Oregon (by median AQI, lower is better)
Monthly Median AQI — 2025
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25
Median AQI
40
90th Percentile
69
Max AQI
181
Days with Data
Ranked #10 of 21 counties in Oregon (by median AQI, lower is better)
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