The EPA's Air Quality Index can tell you whether breathing outside air can be harmful. Here's how to read the scale to plan ...

With wildfire smoke in the forecast, track the drop in air quality across dozens of PurpleAir sensors with our live, updating ...

The DEC has issued an air quality health advisory for most of upstate New York due to elevated levels of fine particulate ...

The Air Quality Index (AQI) is a national system developed by the U.S. Environmental Protection Agency (EPA) to translate various air pollutant concentrations into a single, easy-to-understand number.

The Minnesota Pollution Control Agency has issued an air quality alert for north central and northeast Minnesota. The alert ...

An Air Quality Alert has been issued for Koochiching County and the northern portion of St. Louis County, in effect until 1 ...

The Illinois Environmental Protection Agency has issued an Air Pollution Action Day for Tuesday, July 15. Here's what to know ...