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 Friday, 09/25/26

Good
AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Friday, 09/25/26

Good

For local forecasts, see table below.

Restrictions For Regulated Community

Friday, 09/25/26

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 Friday, 09/25/26
FineParticles (PM2.5)		 Friday, 09/25/26
Ozone (O3)		 Saturday, 09/26/26
FineParticles (PM2.5)		 Saturday, 09/26/26
Ozone (O3)
Bridgeport 17 27
Danbury 17 25
Greenwich 17 28
Hartford 17 25
Madison 17 30
Middletown 17 27
New Haven 17 23
New London-Groton 17 29
Stafford 11 26
Stratford 17 27
Torrington 11 24
Waterbury 17 27
Westport 17 27

Receive AQI Notices

  • DEEP Air Quality Information 

    Subscribe to receive a daily ozone forecast between May 1 through September 30, and a daily PM2.5 forecast year round.

  • DEEP Ozone Forecast 

    Subscribe to receive a daily 8-hour ozone forecast for Connecticut's Industrial and Electric Generating Units' combustion sources from May 1 through September 30.

  • EnviroFlash 

    Subscribe to receive air quality information by e-mail


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.