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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, 06/10/26

Good to Moderate
AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Wednesday, 06/10/26

Good to Moderate

Forecast for Thursday, 06/11/26

Moderate to Unhealthy For Sensitive Groups

For local forecasts, see table below.

Restrictions For Regulated Community

Wednesday, 06/10/26

Restrictions Do Not Apply

Thursday, 06/11/26

Restrictions 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, 06/10/26
FineParticles (PM2.5)		 Wednesday, 06/10/26
Ozone (O3)		 Thursday, 06/11/26
FineParticles (PM2.5)		 Thursday, 06/11/26
Ozone (O3)
Bridgeport 56 80 52 105
Danbury 54 80 50 67
Greenwich 56 80 52 101
Hartford 54 84 52 67
Madison 39 67 54 101
Middletown 54 64 52 84
New Haven 52 71 52 101
New London-Groton 39 44 54 108
Stafford 54 58 44 71
Stratford 56 80 52 105
Torrington 54 74 44 54
Waterbury 52 64 50 84
Westport 56 84 52 101

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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.