Fairfax County, Virginia
AQI 44 · Good44
Median AQI
64
90th Percentile
124
Max AQI
274
Days with Data
Ranked #30 of 30 counties in Virginia (by median AQI, lower is better)
Monthly Median AQI — 2025
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44
Median AQI
64
90th Percentile
124
Max AQI
274
Days with Data
Ranked #30 of 30 counties in Virginia (by median AQI, lower is better)
Click a bar to view that month's details