标签：#smoke

This year’s World Cup has faced sweltering heat and humidity. Now it may need to deal with wildfire smoke.

The US is home to some of the most polluted air on the planet as smoke from 120 out-of-control Canadian wildfires drifts across the border.

Roughly 100 fires are raging out of control in Ontario, sending smoke streaming 1,000 miles to the south and east.