Humboldt County, California
AQI 36 · Good36
Median AQI
54
90th Percentile
75
Max AQI
303
Days with Data
Ranked #9 of 46 counties in California (by median AQI, lower is better)
Monthly Median AQI — 2025
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36
Median AQI
54
90th Percentile
75
Max AQI
303
Days with Data
Ranked #9 of 46 counties in California (by median AQI, lower is better)
Click a bar to view that month's details