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

AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Saturday, 09/06/25

Moderate

Forecast for Sunday, 09/07/25

Good

For local forecasts, see table below.

Restrictions For Regulated Community

Saturday, 09/06/25

Sunday, 09/07/25

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, 09/06/25
FineParticles (PM2.5)		 Saturday, 09/06/25
Ozone (O3)		 Sunday, 09/07/25
FineParticles (PM2.5)		 Sunday, 09/07/25
Ozone (O3)
Bridgeport 61 49 44 41
Danbury 61 45 44 40
Greenwich 61 50 44 43
Hartford 60 44 39 37
Madison 56 42 33 36
Middletown 60 41 39 38
New Haven 56 38 33 37
New London-Groton 56 39 33 35
Stafford 61 37 44 34
Stratford 61 49 44 41
Torrington 61 49 44 33
Waterbury 61 41 44 38
Westport 61 50 44 42