The EPA measures regional air quality index (AQI) by how hazardous it is to the general public. Discover the AQI in your city by searching below.

In most places, the gold standard for air quality data is the EPA’s AirNow program It uses sensitive pollution sensors placed around the country to build an Air Quality Index, or AQI ...

Instead, the U.S. air quality index looks at five pollutants regulated under the Clean Air Act: ground-level ozone, particulate matter, carbon monoxide, sulfur dioxide, and nitrogen dioxide, the EPA ...