The maps offer real-time insight into where smoke is driving air quality into unhealthy or even hazardous territory.

Seattle and Portland briefly ranked within the top 10 cities in the world with the worst air quality the morning of Aug. 6.

Heavy smoke from several large wildfires blazing in Canada and Minnesota engulfed large swaths of the Midwest and East Coast.

Dozens of wildfires are burning across Oregon, affecting more than 1 million acres. But effects from active wildfires across the West are being felt as far away as the Midwest, as smoke is blanketing ...

Canadian wildfire smoke may blanket parts of the Midwest and Northeast into August, raising air-quality and health concerns.

Wildfire smoke is made of a mix of pollutants, including fine and small particle pollution called PM2.5, one of the most dangerous forms.

Milwaukee experienced its worst air quality on record July 16 as smoke from Canadian wildfires blankets swathes of the country.

Large portions of the East Coast are under air quality alerts due to wildfire smoke from Canada and Minnesota. But how di the wildfires start?

Smoke from wildfires in the western U.S. and Canada is expected to cause hazy skies over Massachusetts. Air quality on Cape Cod was listed as "good" as of Monday evening, and no official alerts have ...

More than 830 wildfires are burning across Canada, with over 100 considered out of control.

A fire burning along California's coast is impacting air quality across parts of Northern California, with some waking up on Friday and smelling or seeing the smoke. The smoke is being transported ...

Firefighters are battling the Woodside Fire near Highway 1 in Sonoma County.