Essex County, Massachusetts
AQI 42 · Good42
Median AQI
58
90th Percentile
136
Max AQI
243
Days with Data
Ranked #11 of 13 counties in Massachusetts (by median AQI, lower is better)
Monthly Median AQI — 2025
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42
Median AQI
58
90th Percentile
136
Max AQI
243
Days with Data
Ranked #11 of 13 counties in Massachusetts (by median AQI, lower is better)
Click a bar to view that month's details