The smaller particles could in fact be more harmful as they can get through the body's natural defenses and cause significant ...

Maps show where new plumes of smoke will cause hazy skies through the end of the week. Low-level smoke is forecast to spread ...

An air quality advisory for Long Island is the result of smoke from Canada wildfires, New York State officials say.

Officials issue an air quality advisory for counties in southwest Michigan as Canadian wildfires burn. Here's what the air ...

Smoke traveling from wildfires in Canada, North Dakota and Minnesota triggered an air quality warning in northern Wisconsin.

Smoke has made its way back into the northern tier of the U.S., prompting air quality alerts in North Dakota, Minnesota and ...

New York state health officials have issued an Air Quality Health Advisory for NYC on Thursday due to the forecast presence ...

Canadian wildfire smoke is triggering air quality alerts across the U.S. Midwest and Northeast on Thursday, as the northern ...

Haze from Canadian wildfires is seen over Lake Michigan as a person runs along the shoreline Monday in Chicago. Wildfires ...

Smoke poured over the Canadian border into eastern Alaska this weekend, bringing poor air quality to communities from ...

PORTLAND, Maine — Smoke from Canadian wildfires started making air quality worse in the eastern U.S. on Wednesday as several ...

An air quality map shows conditions improving in the U.S. on Friday as smoke from the Canadian wildfires subsides.