Since Thursday, thousands have flooded the Wisconsin State Fair grounds. "You can actually look directly at the sun now ...

Smoke and grit from hundreds of forest fires have spread across large parts of Canada and the northern US, sending air quality across the Midwest and northeast US and Toronto to unhealthy levels.

The festival kicked off Thursday, when Chicago had the worst air quality in the world for a few hours. But haze didn't choke ...

An air quality alert remains in effect for Coos, Carroll and Grafton counties in New Hampshire until 11:00 p.m. Sunday. Folks who are sensitive to poorer air quality should limit strenuous or ...

Millions of Canadians were warned to limit their time outdoors on Sunday with wildfire smoke hanging in the air from B.C. to ...