Air Quality

Air Quality

Air pollution is a concern for everyone. Air pollution has been linked to a number of health problems like asthma, heart disease, and breathing problems among others. Although national air quality has improved over the last 20 years, there are still many challenges in protecting public health and the environment for air quality problems.

The Air Quality Index (AQI) is used for reporting daily air quality. The AQI is a based on five major air pollutants regulated by the EPA under the Clean Air Act: ground level pollution, particulate pollution, carbon monoxide, sulfur dioxide, and nitrogen dioxide.
Below you can see most recent AQI for New England.

Additional Resources:
Connecticut DEEP Air Quality Page
EPA Air Now

Air Quality Ozone Data

YearCountyDays Above StandardPerson Days Above Standard
  • 1
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County Air Quality Particulate Matter 2.5

YearCountyAvg PM2.5 Concentration% Days Over StandardPerson Days Above PM2.5 Standard
  • 1
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State Air Quality Particulate Matter 2.5

YearCounties With MonitorsCounties Without Monitors% Population > Standard% Population < Standard
  • 1
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Current Hourly AQI (combined) from EPA AirNow

Current Ozone AQI Map for CT, NY and NJ AQI Logo
AQI Scale

Ozone data is published as soon as practical after the end of each hour and as such are not fully validated. Therefore, data are only approved for the expressed purpose of reporting and forecasting the AQI. This map represents the current air quality as a result of combining the particulate and ozone AQIs into one map.
EPA AIRNow