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Toronto’s air quality among the worst globally

SOUTHERN ONTARIO, AUG 4 – Wildfire smoke from northern Ontario and the Prairies caused Toronto's air quality to reach 'very high risk' levels, with vulnerable groups advised to limit outdoor activities, Environment Canada said.

  • Toronto's Air Quality Health Index rating was over 10 on Monday morning, indicating 'very high risk' due to wildfire smoke.
  • Environment Canada issued a special air quality statement for southern Ontario, warning of poor air quality and reduced visibility.
  • On Monday, Toronto ranked fourth in the world for worst air quality, classified as 'unhealthy' by IQAir.
  • Wildfires in northern Ontario are affecting air quality, with 54 wildfires reported, nine of which are not under control.
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Canada faces what could be the second worst season of forest fires in its history, only behind 2023, when the flames burned more than 17 million hectares, an area greater than that of European countries such as Greece or Tunisia. And the air of its cities is raging and polluted. The average for the period of fires in the last decade is 800,000 hectares, but to date almost 7 million hectares have been calcined and the smoke is so intense that it …

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Montreal and Toronto were still among the top five cities with the worst air quality in the world on Monday morning.

·Montreal, Canada
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CBC News broke the news in Canada on Sunday, August 3, 2025.
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