Toronto is currently among the world's most polluted cities. Wildfire smoke is pushing PM2.5 and AQI to unhealthy levels, with concerns for air quality in neighbouring US too.

Toronto is among the world's worst-polluted cities currently, and it could affect US cities too. Here's why

Canada's most populous city Toronto was pegged as the most polluted major city anywhere in the world after the smoke from the country's worst-ever wildfires continues to impact air quality on Wednesday.

Toronto becomes most polluted major city as Canada wildfires put millions at risk

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Toronto is among the world's worst-polluted cities currently, and it could affect US cities too. Here's why

Toronto becomes most polluted major city as Canada wildfires put millions at risk