More than 100 million people are under air quality alerts Friday from Wisconsin to Vermont and down to North Carolina, as smoke from Canadian wildfires continues to waft south, though conditions are expected to improve slowly into the weekend.

Dangerous air quality and hazy skies persist from Toronto to Washington, DC, as smoke from Canada's raging wildfires drifts south — with more than 120 million under air quality alerts within the US.

Over 80 million people from the Midwest to the East Coast are under air quality alerts as smoke from the Canadian wildfires sweep across the US border Tuesday, prompting beach closures, warnings about reduced visibility and calls to stay indoors.