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 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.

COLUMBUS, Ohio — Columbus is under an Air Quality Alert Tuesday due to elevated ozone levels. Mid-Ohio Regional Planning ...

An air quality alert was issued by the National Weather Service in Green Bay at 11:55 a.m. on Tuesday, July 15.

The Department of Environmental Conservation (DEC) issued an air quality alert for north and central Vermont for Tuesday, ...

The Illinois EPA declared an Air Pollution Action Day in the Chicago metro area. See today's air quality index forecast for Illinois.