But when smoke plumes are close to the surface, people are breathing in wildfire chemicals and tiny particles. Those particles, known as PM2.5, can get deep into the lungs and exacerbate asthma and ...

State officials from Maine to New York issued alerts for fine particulate matter, a toxic byproduct of wildfires that is small enough to be inhaled.

New York, Boston and much of the Northeast can expect to see smoky skies as smoke from Canadian wildfires blows into the area ...

Most of the Lower Peninsula has good to moderate air quality on July 26. Nationally, the northeast has the nation's worst air ...

At 12:40 p.m. Thursday, the National Weather Service issued the alert for Midland, Bay, Saginaw, Huron, Tuscola and Sanilac ...

Smoke from Canadian wildfires persisted across the Upper Midwest on Friday, prompting air quality alerts for millions.

Canadian wildfire smoke returns, bringing haze to Michigan. As of July 25, advisories are in effect for the U.P. and northern ...

Canadian wildfire smoke will significantly impact air quality across Michigan on Friday, with unhealthy conditions expected ...

A couple of stray showers could linger into the night. Otherwise, this will be a quiet and partly cloudy night. Lows will ...

Likewise, most of Wisconsin had been issued an air quality alert over Canadian wildfire smoke. "People with heart disease: ...

Canadian Wildfires some still burning from this past April will push Unhealthy Levels of Smoke into northern Minnesota Today ...

Smoke from Canadian wildfires again plagued portions of the northern United States on July 16, prompting air quality alerts from Illinois to Maine.