Air Quality in Connecticut
10-year air quality trends for 8 monitored areas in Connecticut.
See full Connecticut air quality rankings →All Monitored Areas in Connecticut
Hartford, Connecticut
Hartford County · AQI 42 (5yr avg) · Improving · PM2.5
Litchfield, Connecticut
Litchfield County · AQI 38 (5yr avg) · Improving · Ozone
Windham, Connecticut
Windham County · AQI 35 (5yr avg) · Stable · Ozone
Middlesex, Connecticut
Middlesex County · AQI 40 (5yr avg) · Stable · Ozone
Tolland, Connecticut
Tolland County · AQI 40 (5yr avg) · Stable · Ozone
New London, Connecticut
New London County · AQI 40 (5yr avg) · Stable · PM2.5
New Haven, Connecticut
New Haven County · AQI 45 (5yr avg) · Improving · PM2.5
Fairfield, Connecticut
Fairfield County · AQI 46 (5yr avg) · Improving · PM2.5
Frequently Asked Questions
Connecticut has 8 monitored areas with an average 5-year AQI of 41 and an average Air Quality Grade of B. 5 cities are improving, 0 are worsening, and 3 are stable.
Hartford, Connecticut has the best Air Quality Grade (B) in Connecticut with a 5-year average AQI of 42.
Of 8 monitored areas in Connecticut, 5 are showing improving trends, 0 are worsening, and 3 remain stable over the past decade.