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 ...

An air quality alert is in effect for parts of northern Minnesota as wildfire smoke from fires burning in Canada again drifts ...

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

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

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

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 ...

The Canadian wildfires are expected to track east and south, expanding in Michigan as Sunday goes on and additional smoke is ...

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

An Air Quality Alert will be in effect through midnight Tuesday for Southeast Michigan, the state's Department of Environment ...

The National Weather Service reported an air quality alert at 11:54 a.m. EDT on Sunday in effect until Tuesday at midnight ...