Grafton County, New Hampshire
AQI 38 · Good38
Median AQI
56
90th Percentile
113
Max AQI
273
Days with Data
Ranked #3 of 7 counties in New Hampshire (by median AQI, lower is better)
Monthly Median AQI — 2025
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38
Median AQI
56
90th Percentile
113
Max AQI
273
Days with Data
Ranked #3 of 7 counties in New Hampshire (by median AQI, lower is better)
Click a bar to view that month's details