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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, 05/12/26

Good
AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Tuesday, 05/12/26

Good

Forecast for Wednesday, 05/13/26

Good

For local forecasts, see table below.

Restrictions For Regulated Community

Tuesday, 05/12/26

Restrictions Do Not Apply

Wednesday, 05/13/26

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, 05/12/26
FineParticles (PM2.5)		 Tuesday, 05/12/26
Ozone (O3)		 Wednesday, 05/13/26
FineParticles (PM2.5)		 Wednesday, 05/13/26
Ozone (O3)
Bridgeport 33 41 50 44
Danbury 28 37 50 44
Greenwich 33 42 50 45
Hartford 28 40 44 42
Madison 22 40 33 42
Middletown 28 41 44 40
New Haven 28 39 44 43
New London-Groton 22 38 33 41
Stafford 17 36 39 39
Stratford 33 41 50 44
Torrington 17 37 39 43
Waterbury 22 41 50 40
Westport 33 42 50 44


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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.