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, 06/02/26

Good

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Tuesday, 06/02/26

Good

For local forecasts, see table below.

Restrictions For Regulated Community

Tuesday, 06/02/26

Restrictions Apply

For details, see operating restrictions page.

Historical Ozone Data

Forecasted Ozone Exceedance Days

Tips for Ozone Action Days

Air Monitoring in Connecticut

For more information, visit the AIRNow Interactive Map of Air Quality website.

Local AQI Forecast

Town	Tuesday, 06/02/26 FineParticles (PM2.5)	Tuesday, 06/02/26 Ozone (O3)
Bridgeport	28	40
Danbury	22	36
Greenwich	28	41
Hartford	28	37
Madison	22	42
Middletown	28	39
New Haven	28	38
New London-Groton	22	43
Stafford	17	34
Stratford	28	40
Torrington	17	35
Waterbury	22	39
Westport	28	41

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. test test
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.