Current air quality is provided below the AQI forecast section.

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 Saturday, 08/09/25

Good to Moderate
AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Saturday, 08/09/25

Good

Forecast for Sunday, 08/10/25

Moderate

For local forecasts, see table below.

Restrictions For Regulated Community

Saturday, 08/09/25

Sunday, 08/10/25

For details, see operating restrictions page.

Historical Ozone Data
Forecasted Ozone Exceedance Days
Tips for Ozone Action Days
Air Monitoring in Connecticut

AIRNOW Interactive Map of Air Quality

Local AQI Forecast

Town Saturday, 08/09/25
FineParticles (PM2.5)		 Saturday, 08/09/25
Ozone (O3)		 Sunday, 08/10/25
FineParticles (PM2.5)		 Sunday, 08/10/25
Ozone (O3)
Bridgeport 50 39 56 97
Danbury 44 39 61 93
Greenwich 50 39 56 100
Hartford 39 43 58 87
Madison 39 38 56 61
Middletown 39 37 58 77
New Haven 50 0 54 80
New London-Groton 39 37 56 61
Stafford 44 33 60 74
Stratford 50 39 56 97
Torrington 44 38 60 67
Waterbury 50 37 58 77
Westport 50 39 56 97