Air Quality in New Hampshire
10-year air quality trends for 7 monitored areas in New Hampshire.
See full New Hampshire air quality rankings →All Monitored Areas in New Hampshire
Rockingham, New Hampshire
Rockingham County · AQI 40 (5yr avg) · Improving · Ozone
Grafton, New Hampshire
Grafton County · AQI 36 (5yr avg) · Improving · Ozone
Belknap, New Hampshire
Belknap County · AQI 32 (5yr avg) · Stable · Ozone
Cheshire, New Hampshire
Cheshire County · AQI 38 (5yr avg) · Improving · PM2.5
Hillsborough, New Hampshire
Hillsborough County · AQI 38 (5yr avg) · Stable · Ozone
Coos, New Hampshire
Coos County · AQI 42 (5yr avg) · Stable · Ozone
Merrimack, New Hampshire
Merrimack County · AQI 37 (5yr avg) · Worsening · Ozone
Frequently Asked Questions
New Hampshire has 7 monitored areas with an average 5-year AQI of 38 and an average Air Quality Grade of B. 5 cities are improving, 1 are worsening, and 1 are stable.
Rockingham, New Hampshire has the best Air Quality Grade (B) in New Hampshire with a 5-year average AQI of 40.
Of 7 monitored areas in New Hampshire, 5 are showing improving trends, 1 are worsening, and 1 remain stable over the past decade.