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 ...

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

The alert will reach the orange air quality level, indicating that sensitive groups should limit time outdoors.

Wisconsin’s northernmost congressman is fed up with smoke and haze from Canada. Congressman Tom Tiffany was on social media ...

The Department of Environmental Protection issued an air quality alert for Maine. Unhealthy for Sensitive Groups levels of ...

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

Additional plumes of smoke from Canada's active wildfires prompt officials to issue a statewide air quality alert on July 14.

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

The 'unhealthy for sensitive groups' air quality in Chicago comes as an air quality alert was issued for the entire state of ...

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

An air quality alert has been issued for all of Michigan for Sunday and Monday due to smoke from Canadian wildfires.