Wildfires in Ontario make Toronto air quality worst in world

Environment Canada has issued health warnings after sky over city turns yellow

Smoke from more than 100 active wildfires in northern Ontario have made Toronto’s air quality the current worst in the world and caused yellow, smoky air in cities across the north-east US.

Environment Canada issued health warnings on Wednesday after the sky over country’s largest city turned a sickly yellow and was ranked the worst in the world according to IQAir, the Swiss technology company that racks global air quality.