Environment Canada has issued health warnings after sky over city turns yellow Smoke from more than 100 active wildfires in northern Ontario have made Toronto’s air quality the current worst in the world and caused yellow, smoky air in cities across the north-east US. Environment Canada issued h...

Source: [Guardian World](https://www.theguardian.com/world/2026/jul/15/wildfires-in-ontario-make-toronto-canada-air-quality-worst-in-world)

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