More than 800 Canadian wildfires burning as air quality alerts extend to US

According to the Canadian Wildland Fire Information System, the vast majority of wildfires are burning out of control.

The large cluster of fires affecting western areas of Ontario are responsible for sending thick plumes of smoke and poor air quality across Thunder Bay and Toronto, with lower concentrations of smoke high in the atmosphere drifting over the Great Lakes and above New York with hazy skies and redder sunrise and sunsets likely.

There will be quite widespread thunderstorms in Ontario over the next few days, but the rain may not be enough to make much of a difference.

Northwesterly winds will continue to blow the smoke into northern US states for the rest of this week and into the weekend, leading to concerns smoke will drift into New Jersey where Sunday’s World Cup final is due to take place.

A change in the wind direction by Monday means that the smoke will tend to be steered across Quebec with an improvement in air quality further south in the US.

Air quality in the Midwestern city of Detroit is currently the worst in the world, Swiss air quality tracker IQAir said, followed by Minneapolis and Toronto.