Air Quality in Connecticut

Connecticut has 8 counties with EPA air quality monitoring. Air quality is stable across the state, with an average of 263 "Good" days per county per year. The best air quality is in Windham (median AQI 34) and the most polluted is Fairfield (median AQI 42).

County	Median AQI	Max AQI	Good Days	Unhealthy Days	Trend	Top Pollutant
Fairfield	42	154	248	21	→ stable	Ozone
Hartford	39	185	280	7	→ stable	Ozone
Litchfield	38	119	305	8	→ stable	Ozone
Middlesex	40	177	178	6	→ stable	Ozone
New Haven	41	156	260	12	→ stable	Ozone
New London	37	126	309	5	→ stable	PM2.5
Tolland	37	156	184	5	→ stable	Ozone
Windham	34	122	340	2	→ stable	Ozone