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 ...

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

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.

Wildfire season is upon us, and smoke is reducing air quality through swaths of the country. Environment Canada suggests ...

Manitoba is looking to expand the infrastructure it has to monitor air quality, a step experts say is important to better map ...

The current infrastructure also isn’t set up to fully account for the shifting behavior of wildfire smoke, which can travel ...