Add Yahoo as a preferred source to see more of our stories on Google. Large wildfires in Canada continued to cause concerning air quality levels across parts of the United States and triggered ...

Smoke from the Bear Gulch Fire in the Olympic National Forest near Lake Cushman has been drifting across a large swath of Western Washington and intermittently worsening the air quality throughout the ...

Canadian wildfire smoke is impacting air quality across a dozen northeastern and midwestern U.S. states. Air quality is expected to remain poor in the Northeast through Tuesday, with some improvement ...