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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 Sunday, 10/18/26

Good
AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Sunday, 10/18/26

Good

Forecast for Monday, 10/19/26

Good

For local forecasts, see table below.

Restrictions For Regulated Community

Ozone forecasting has come to a close. Ozone concentrations from October through April are expected to remain in the GOOD, to occasionally MODERATE range.

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 Sunday, 10/18/26
FineParticles (PM2.5)		 Sunday, 10/18/26
Ozone (O3)		 Monday, 10/19/26
FineParticles (PM2.5)		 Monday, 10/19/26
Ozone (O3)
Bridgeport 22 28
Danbury 22 28
Greenwich 22 28
Hartford 22 33
Madison 17 22
Middletown 22 33
New Haven 17 28
New London-Groton 17 22
Stafford 17 22
Stratford 22 28
Torrington 17 22
Waterbury 22 33
Westport 22 28

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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.