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

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

Unhealthy air has invaded Minnesota, Wisconsin and North Dakota early this week as a new round of wildfire smoke from Canada ...

A study in Ontario found continued exposure to fine particulate matter is linked to higher levels of diffuse myocardial ...

Here's what we know Monday, July 14 about the fast growing Green Fire and suppression efforts in the Shasta-Trinity National ...

The Illinois Environmental Protection Agency has issued an Air Pollution Action Day for Tuesday, July 15. Here's what to know ...

Many communities in Arizona, Michigan, Illinois, New York and across North America are experiencing poor air quality due to ...

Officials warn southeast Michigan residents to be careful outdoors Tuesday because of expected high ozone pollution levels.

Smoke from northern Ontario forest fires will cause poor air quality and reduced visibility in Sarnia Monday, according to ...

As record wildfires erupt across Canada this year, with health-threatening smoke drifting into the U.S. and as far away as ...

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