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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, 08/24/26

Good
AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Monday, 08/24/26

Good

For local forecasts, see table below.

Restrictions For Regulated Community

Monday, 08/24/26

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, 08/24/26
FineParticles (PM2.5)		 Monday, 08/24/26
Ozone (O3)		 Tuesday, 08/25/26
FineParticles (PM2.5)		 Tuesday, 08/25/26
Ozone (O3)
Bridgeport 50 40
Danbury 44 41
Greenwich 50 42
Hartford 50 42
Madison 44 40
Middletown 50 39
New Haven 44 39
New London-Groton 44 39
Stafford 39 38
Stratford 50 40
Torrington 39 39
Waterbury 50 39
Westport 50 41

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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.