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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 Monday, 05/19/25

Good
AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Monday, 05/19/25

Good

Forecast for Tuesday, 05/20/25

Good

For local forecasts, see table below.

Restrictions For Regulated Community

Monday, 05/19/25

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 Monday, 05/19/25
FineParticles (PM2.5)		 Monday, 05/19/25
Ozone (O3)		 Tuesday, 05/20/25
FineParticles (PM2.5)		 Tuesday, 05/20/25
Ozone (O3)
Bridgeport 39 28
Danbury 39 17
Greenwich 39 28
Hartford 33 28
Madison 33 22
Middletown 33 28
New Haven 39 22
New London-Groton 33 22
Stafford 33 11
Stratford 39 28
Torrington 33 11
Waterbury 39 22
Westport 39 28
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.