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.

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.

Flights at Logan airport were operating on a delay of 52 minutes due to low visibility on Monday afternoon, according to an advisory from the Federal Aviation Administration. Earlier on Monday, there was a brief ground stop at the airport "due to smoke and haze impacting operations," according to the FAA.