New Castle County, Delaware
AQI 46 · Good46
Median AQI
69
90th Percentile
161
Max AQI
182
Days with Data
Ranked #3 of 3 counties in Delaware (by median AQI, lower is better)
Monthly Median AQI — 2025
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46
Median AQI
69
90th Percentile
161
Max AQI
182
Days with Data
Ranked #3 of 3 counties in Delaware (by median AQI, lower is better)
Click a bar to view that month's details