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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 Tuesday, 09/01/26

Good
AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Tuesday, 09/01/26

Good to Moderate

Forecast for Wednesday, 09/02/26

Good

For local forecasts, see table below.

Restrictions For Regulated Community

Tuesday, 09/01/26

Restrictions Do Not Apply

Wednesday, 09/02/26

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 Tuesday, 09/01/26
FineParticles (PM2.5)		 Tuesday, 09/01/26
Ozone (O3)		 Wednesday, 09/02/26
FineParticles (PM2.5)		 Wednesday, 09/02/26
Ozone (O3)
Bridgeport 54 48 22 31
Danbury 52 43 22 30
Greenwich 54 48 22 31
Hartford 56 27 28 31
Madison 44 44 17 31
Middletown 56 37 28 31
New Haven 52 46 22 28
New London-Groton 44 31 17 30
Stafford 54 48 17 30
Stratford 54 48 22 31
Torrington 44 28 17 31
Waterbury 54 37 22 31
Westport 54 49 22 31

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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.