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

Smoke from wildfires in Manitoba, a Western province facing its worst fire season in 30 years, has created hazardous air ...

Air quality warnings are in effect for a large area of Western and Central Canada this weekend as wildfire smoke continues to choke parts of the country. Many communities in Manitoba, as well as ...

Fine particle levels are expected to reach the purple air quality index category, which means it is considered “very ...

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

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 all of Michigan for Sunday and Monday due to smoke from Canadian wildfires.

The Maine Department of Environmental Protection has issued an Air Quality Alert for Northern Maine Tuesday due to elevated ...

The Chicago area recorded ozone levels of 156 late Monday afternoon. Levels above 100 are considered unhealthy. Residents ...

The Michigan Department of Environment, Great Lakes, and Energy issued southeast Michigan's sixth air quality advisory of the ...

An air quality alert for northwest Minnesota has been extended to cover the entire state and run through Monday.

EDT the National Weather Service reported an air quality alert in effect until Monday at noon EDT for Midland, Bay, Huron, ...