AirAPIIndex - CT Environmental Public Health Tracking Portal

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.

Learn More about Air Quality:
Connecticut DEEP Air Quality Page
EPA Air Now

The Nationally Consistent Data Measures (NCDMs) for Air Quality are:

Annual PM 2.5 Level (Monitored & Modeled Data)

Annual average ambient concentrations of PM 2.5 in micrograms per cubic meter, based on seasonal averages and daily measurement

PM2.5 - Days Above Regulatory Standard (Monitor & Modeled Data)

Percent of days with PM2.5 levels over the National Ambient Air Quality Standard

Ozone - Days Above Regulatory Standard (Monitored & Modeled Date)

Number of days with maximum 8-hour average ozone concentration over the National Ambient Air Quality Standard

Each of the Air Quality NCDMs are available in the table on this page.

The Annual PM2.5 National Ambient Air Quality Standard (NAAQS) is 12.0 micrograms per cubic meter.
The daily ozone National Ambient Air Quality Standard (NAAQS) is 0.070 ppm. EPA established this new 8-hour standard for ozone of 0.070 parts per million (ppm) in 2015.
The previous 8-hour standard was set at 0.075 ppm.
The daily PM2.5 National Ambient Air Quality Standard (NAAQS) is 35.0 micrograms per cubic meter.

**State Measured and Modeled* Air Quality [Average PM2.5, % Days over Standard, Ozone Days above Standard]**

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