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 Thursday, 07/16/26

Moderate

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Thursday, 07/16/26

Unhealthy For Sensitive Groups to Unhealthy

For local forecasts, see table below.

Restrictions For Regulated Community

Thursday, 07/16/26

Restrictions Do Not 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	Thursday, 07/16/26 FineParticles (PM2.5)	Thursday, 07/16/26 Ozone (O3)
Bridgeport	185	67
Danbury	182	54
Greenwich	185	51
Hartford	149	58
Madison	136	77
Middletown	149	64
New Haven	175	64
New London-Groton	136	64
Stafford	171	51
Stratford	185	67
Torrington	171	51
Waterbury	178	64
Westport	185	71

Receive AQI Notices

DEEP Air Quality Information
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DEEP Ozone Forecast
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EnviroFlash
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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.