Smoke From Canadian Wildfires Makes Toronto's Air the Dirtiest in the World

On July 15, 2026, smoke from 838 wildfires burning across Canada — mostly in northwestern Ontario — turned Toronto's skies dark and gave the city the worst air quality on Earth, Reuters reported. Think of it as a giant campfire blowing smoke over a neighborhood. Environment Canada warned that the air was unhealthy, especially for sensitive groups. The smoke also reached New England.