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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, 09/09/26

Good
AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Wednesday, 09/09/26

Good to Moderate

Forecast for Thursday, 09/10/26

Good

For local forecasts, see table below.

Restrictions For Regulated Community

Wednesday, 09/09/26

Restrictions Do Not Apply

Thursday, 09/10/26

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, 09/09/26
FineParticles (PM2.5)		 Wednesday, 09/09/26
Ozone (O3)		 Thursday, 09/10/26
FineParticles (PM2.5)		 Thursday, 09/10/26
Ozone (O3)
Bridgeport 56 49 50 44
Danbury 54 47 39 42
Greenwich 56 48 50 46
Hartford 54 48 44 42
Madison 50 44 50 44
Middletown 54 47 44 41
New Haven 52 46 50 44
New London-Groton 50 45 50 46
Stafford 52 43 33 38
Stratford 56 49 50 44
Torrington 52 44 33 37
Waterbury 56 47 44 41
Westport 56 50 50 45

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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.