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 ...

An air quality alert was issued by the National Weather Service in Milwaukee-Sullivan at 9:26 a.m. on Wednesday, July 16.

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

REDDING, Calif. — Wildfire smoke in the Northstate can impact recreational sites like the Redding Aquatic Center (RAC).

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.

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

Canadian wildfire smoke will impact all of Wisconsin throughout the weekend. The air quality index is expected to reach the ...