Smoke produced by hundreds of wildfires burning across Canada has drifted thousands of miles and nearly circled the entire globe, with hazy skies now seen across parts of North America, Europe and even parts of Russia.

As Canada grapples with one of its worst wildfire seasons on record, smoke from the blazes have prompted air quality alerts across the U.S.

Hundreds of wildfires still burning in Canada are expected to undermine air quality across the Upper Midwest and Northeast into Tuesday.