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Air Quality Index

The U. S. Environmental Protection Agency (EPA) has provided a scale called the Air Quality Index (AQI) for rating air quality. This scale is based on the National Ambient Air Quality Standards (NAAQS). The AQI forecast is updated once daily, excluding weekends and holidays. Alternatively, you may call the Air Quality Index Hotline at (800) 249-1234 or (860) 424-4167 for the forecast or link to Airnow.gov for the most current air quality information.

Current air quality is provided below the AQI forecast section.



Current Air Quality

Air Quality for Wednesday, 09/16/26

Good
AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Wednesday, 09/16/26

Good

Forecast for Thursday, 09/17/26

Good to Moderate

For local forecasts, see table below.

Restrictions For Regulated Community

Wednesday, 09/16/26

Restrictions Do Not Apply

Thursday, 09/17/26

Restrictions Do Not Apply

For details, see operating restrictions page.

Historical Ozone Data
Forecasted Ozone Exceedance Days
Tips for Ozone Action Days
Air Monitoring in Connecticut
 

Local AQI Forecast

Town Wednesday, 09/16/26
FineParticles (PM2.5)		 Wednesday, 09/16/26
Ozone (O3)		 Thursday, 09/17/26
FineParticles (PM2.5)		 Thursday, 09/17/26
Ozone (O3)
Bridgeport 22 37 60 47
Danbury 33 44 58 50
Greenwich 22 36 58 50
Hartford 39 44 60 49
Madison 17 41 50 45
Middletown 39 42 60 50
New Haven 28 35 54 46
New London-Groton 17 36 50 44
Stafford 17 43 52 44
Stratford 22 37 60 47
Torrington 17 38 52 45
Waterbury 33 42 60 50
Westport 22 37 60 48

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If you have any questions regarding the Air Quality Forecast, please contact the Bureau of Air Management by phone at (860) 424-4152 or by email.