Union County, New Jersey
AQI 45 · Good45
Median AQI
62
90th Percentile
71
Max AQI
180
Days with Data
Ranked #15 of 15 counties in New Jersey (by median AQI, lower is better)
Monthly Median AQI — 2025
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45
Median AQI
62
90th Percentile
71
Max AQI
180
Days with Data
Ranked #15 of 15 counties in New Jersey (by median AQI, lower is better)
Click a bar to view that month's details