Worst Air Quality Cities in Connecticut Today

Cities ranked by current Air Quality Index (AQI) readings across Connecticut.

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Cities in Connecticut Ranked by Highest Air Quality Index (AQI)

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This ranking compares real-time Air Quality Index (AQI) values to identify where air pollution levels are currently highest.

Air pollution levels may fluctuate throughout the day as atmospheric conditions and local emission sources change.

Air Quality Index (AQI) values are calculated from several monitored pollutants including fine particulate matter (PM2.5), PM10, ground-level ozone (O₃), nitrogen dioxide (NO₂), sulfur dioxide (SO₂), and carbon monoxide (CO). Additional pollutants such as ammonia (NH₃) and nitric oxide (NO) may also be displayed for broader air quality monitoring.

[*] Note: Weather information applies only to cities currently available in our database. We are continuously expanding and updating our coverage, but we do not yet provide weather data for all cities in the United States.