World leaders may face smoke warnings when they gather next week in Alberta as wildfires burned out of control across much of Canada and caused the country's second-worst fire season in decades. The Kananaskis area of the Canadian Rocky Mountains,

Forecasters warn that hazy, grayish-blue skies could persist for many weeks as fires continue to burn, though most smoke will remain high in the atmosphere.

Blanc, the tallest mountain in Western Europe, as a result of massive wildfires raging across Canada. The smoke has traveled thousands of miles, crossing the Atlantic to reach the French-Italian Alps.