World
Wildfires in Ontario Impact Air Quality
Wildfires in northern Ontario have caused Toronto’s air quality to become the worst in the world, prompting health warnings. Smoke has spread across northeastern US cities.
Coverage timeline — 1 article
The Guardian
Environment Canada issued health warnings after sky over city turns yellowSmoke from more than 100 active wildfires in northern Ontario have made Toronto’s air quality the worst in the world on Wednesday and caused yellow, smoky air in cities across the northeast US.Environment Cana
2026-07-15 16:08 UTC