Middlesex County, New Jersey
AQI 36 · Good36
Median AQI
55
90th Percentile
93
Max AQI
178
Days with Data
Ranked #1 of 15 counties in New Jersey (by median AQI, lower is better)
Monthly Median AQI — 2025
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36
Median AQI
55
90th Percentile
93
Max AQI
178
Days with Data
Ranked #1 of 15 counties in New Jersey (by median AQI, lower is better)
Click a bar to view that month's details