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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, 06/01/26

Good
AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Monday, 06/01/26

Good

Forecast for Tuesday, 06/02/26

Good

For local forecasts, see table below.

Restrictions For Regulated Community

Monday, 06/01/26

Restrictions Do Not Apply

Tuesday, 06/02/26

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 Monday, 06/01/26
FineParticles (PM2.5)		 Monday, 06/01/26
Ozone (O3)		 Tuesday, 06/02/26
FineParticles (PM2.5)		 Tuesday, 06/02/26
Ozone (O3)
Bridgeport 39 38 28 40
Danbury 39 39 22 36
Greenwich 39 40 28 41
Hartford 44 40 28 37
Madison 33 38 22 42
Middletown 44 39 28 39
New Haven 39 38 28 38
New London-Groton 33 37 22 43
Stafford 33 37 17 34
Stratford 39 38 28 40
Torrington 33 35 17 35
Waterbury 44 39 22 39
Westport 39 39 28 41

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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.