More than 700 active wildfires burning across Canada and about two-thirds are currently out-of-control

Billowing smoke from hundreds of out-of-control wildfires – most of which are in the Canadian Prairies – have caused severe air quality alerts across Canada and the United States.

Detroit, Michigan, and the Canadian cities of Montreal and Toronto, recorded some of the worst air quality in the world on Monday, according to a ranking by IQAir, a Swiss air quality technology company.

More than 700 active wildfires are currently burning across Canada and about two-thirds of them are currently out-of-control, according to the Canadian Interagency Forest Fire Centre (CIFFC), a non-profit organization that is owned by government agencies.

One brush fire, in British Colombia, was reportedly caused when an osprey dropped a fish onto powerline, sparking a small blaze which was later extinguished.