Toronto’s air quality ranked worst in the world as wildfire smoke drifts into region CTV NewsToronto air quality among world’s worst as wildfire smoke blankets city Radio-CanadaToronto’s air quality 3rd‑worst in the world as heat hammers city CityNews TorontoAir quality expected to be poor again northeast of Sault SooToday.comDrifting wildfire smoke blankets southern Ontario, prompts air quality warnings CHCH
