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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, 09/15/26

Good
AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Tuesday, 09/15/26

Good

Forecast for Wednesday, 09/16/26

Good

For local forecasts, see table below.

Restrictions For Regulated Community

Tuesday, 09/15/26

Restrictions Do Not Apply

Wednesday, 09/16/26

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
 

Local AQI Forecast

Town Tuesday, 09/15/26
FineParticles (PM2.5)		 Tuesday, 09/15/26
Ozone (O3)		 Wednesday, 09/16/26
FineParticles (PM2.5)		 Wednesday, 09/16/26
Ozone (O3)
Bridgeport 33 38 22 37
Danbury 28 39 33 44
Greenwich 33 37 22 36
Hartford 33 34 39 44
Madison 22 32 17 41
Middletown 33 35 39 42
New Haven 33 36 28 35
New London-Groton 22 31 17 36
Stafford 22 33 17 43
Stratford 33 38 22 37
Torrington 22 37 17 38
Waterbury 28 35 33 42
Westport 33 39 22 37

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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.