Collin County, Texas
AQI 39 · Good39
Median AQI
67
90th Percentile
151
Max AQI
209
Days with Data
Ranked #17 of 45 counties in Texas (by median AQI, lower is better)
Monthly Median AQI — 2025
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39
Median AQI
67
90th Percentile
151
Max AQI
209
Days with Data
Ranked #17 of 45 counties in Texas (by median AQI, lower is better)
Click a bar to view that month's details