Wildfires in Canada's Ontario cause severe smog, disrupt rail traffic

Wildfires sweeping across northwestern Ontario, Canada, in recent days have caused severe smog and a sharp deterioration in air quality in several regions, including Ottawa, the nation's capital, and Toronto, Canada's largest city.



On Wednesday morning, Toronto's air quality index ranked the worst among major global cities. According to data released by Environment Canada, Toronto's Air Quality Health Index was classified as "very high risk." Ottawa also issued air quality alerts due to a combination of wildfire smoke and humid weather, with high humidity trapping smoke particles in the air and turning the sky yellow.