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 Tuesday, 05/13/25

Good to Moderate
AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Tuesday, 05/13/25

Good to Moderate

For local forecasts, see table below.

Restrictions For Regulated Community

Tuesday, 05/13/25

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 Tuesday, 05/13/25
FineParticles (PM2.5)		 Tuesday, 05/13/25
Ozone (O3)		 Wednesday, 05/14/25
FineParticles (PM2.5)		 Wednesday, 05/14/25
Ozone (O3)
Bridgeport 50
Danbury 54
Greenwich 50
Hartford 58
Madison 44
Middletown 58
New Haven 52
New London-Groton 44
Stafford 58
Stratford 50
Torrington 58
Waterbury 56
Westport 50
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.