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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 Monday, 08/31/26

Good
AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Monday, 08/31/26

Good to Moderate

Forecast for Tuesday, 09/01/26

Good to Moderate

For local forecasts, see table below.

Restrictions For Regulated Community

Monday, 08/31/26

Restrictions Do Not Apply

Tuesday, 09/01/26

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 Monday, 08/31/26
FineParticles (PM2.5)		 Monday, 08/31/26
Ozone (O3)		 Tuesday, 09/01/26
FineParticles (PM2.5)		 Tuesday, 09/01/26
Ozone (O3)
Bridgeport 54 64 54 48
Danbury 54 50 52 43
Greenwich 54 67 54 48
Hartford 52 50 56 27
Madison 50 58 44 44
Middletown 52 50 56 37
New Haven 54 54 52 46
New London-Groton 50 51 44 31
Stafford 50 46 54 48
Stratford 54 64 54 48
Torrington 50 46 44 28
Waterbury 54 50 54 37
Westport 54 67 54 49

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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.