The smoke from the wildfires in northern Ontario is expected to linger around until Friday. Check where and how it's moving here.

Over 800 wildfires are burning through forests in Canada, prompting heavy smoke warnings for millions of Americans.

Wildfire smoke has settled thickly in parts of New York, Connecticut, Wisconsin, Michigan and Minnesota—and it’s heading further south.

There are more than 830 wildfires in Canada as of Wednesday morning.

As of Tuesday night, just under 200 total active wildfires have been reported, according to the province.

Yellow-orange haze has blanketed Toronto since early Wednesday morning, as the impacts of raging wildfires in other parts of the province drift over with the wind.

Environment Canada has issued health warnings after sky over city turns yellow

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

Over 100 wildfires are burning in Canada, with winds carrying the smoke southeast. Warnings about unhealthy air extend from Minnesota through Toronto and into New York.

Warnings about dangerous, unhealthy air extended Wednesday from Minnesota through Toronto and into New York.

Warnings about dangerous, unhealthy air extended Wednesday from Minnesota through Toronto and into New York.

Plusieurs feux de forêt ravagent le nord-ouest de l'Ontario. Selon la société IQAir, la capitale de la province, Toronto, était mercredi soir la deuxième métropole la plus polluée…

The smoke from the wildfires in northern Ontario is expected to linger around until Friday. Check where and how it's moving here.

Residents have been warned to stay indoors to avoid both the smoke and the extreme heat

Air quality was so bad on Wednesday morning that Toronto had the dubious distinction of having the most polluted air of any city on Earth.

TORONTO/NEW YORK: Toronto’s air quality ranked the worst among major cities globally on Wednesday as wildfire smoke from northwestern Ontario blackened skies and spread into the…

More than 830 wildfires were burning in Canada on Wednesday, along with more than a dozen in northern Minnesota, forcing mandatory evacuations.

Roughly 100 wildfires are raging out of control in Ontario, sending smoke streaming more than 1,000 miles from their origin.

A thick orange haze hung over Toronto on Wednesday 15 July as smoke from wildfires in northwestern Ontario engulfed Canada's largest city, giving it the worst air quality of any…

Fires in parts of Canada are blanketing several cities with smoke. Experts recommend limiting time outside, purifying indoor air and wearing a respirator if outside.

Wildfire smoke is dense enough in a handful of states that experts recommend masks for those who can’t stay indoors.