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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, 07/15/25

Good to Moderate
AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Tuesday, 07/15/25

Good to Moderate

Forecast for Wednesday, 07/16/25

Moderate to Unhealthy For Sensitive Groups

For local forecasts, see table below.

Restrictions For Regulated Community

Tuesday, 07/15/25

Restrictions Do Not Apply

Wednesday, 07/16/25

Restrictions Apply

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, 07/15/25
FineParticles (PM2.5)		 Tuesday, 07/15/25
Ozone (O3)		 Wednesday, 07/16/25
FineParticles (PM2.5)		 Wednesday, 07/16/25
Ozone (O3)
Bridgeport 50 61 52 112
Danbury 44 58 54 112
Greenwich 50 67 52 115
Hartford 33 50 56 100
Madison 33 49 52 93
Middletown 33 50 56 90
New Haven 39 51 52 77
New London-Groton 33 48 52 84
Stafford 44 50 54 61
Stratford 50 61 52 112
Torrington 44 44 54 108
Waterbury 39 50 52 90
Westport 50 64 52 112
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.