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.

With hundreds of wildfires burning across Canada, smoke has drifted into the northern United States, lowering air quality across roughly a dozen states.

Millions of people across the Upper Midwest and the Northeast are under air quality alerts Monday, as smoke from wildfires in Canada drift over the region