Multiple U.S. states and Canadian provinces are experiencing poor air quality from wildfire smoke. Here's where.

Sensitive groups are advised to stay indoors and limit outdoor activities as pollution and ozone levels spike to unhealthy ...

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 ...

Wildfire smoke degrades air quality in swaths of Ontario, with Toronto ranking among the worst in the world on Monday.

Milwaukee, Ozaukee, Racine, Kenosha and Sheboygan counties are all under a poor air quality alert from noon to 11 p.m., ...

Tuesday’s air quality warning has dropped to a 5, considered a moderate risk, down from Monday’s peak of 10+ on the Air ...

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

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

Canadian wildfire smoke lingers in Michigan. Officials issued an air quality advisory in southeast Michigan for July 15.

Much of Central Canada, Manitoba and Saskatchewan were placed under special air quality statements or warnings on Monday due ...

With various air quality indexes available, and as wildfire smoke becomes an increasing health risk, here’s what often goes ...

CHICAGO (WLS) -- An air quality alert was issued by the National Weather Service for the Chicago area. Chopper 7 captured as ...