From CBC News.

Parts of Ontario and Quebec were covered in a thick haze recently, as wildfire smoke from Manitoba and Saskatchewan infiltrated the regions. The poor air quality raised health concerns in parts of the provinces, including in Toronto, which was ranked by a global tracker as the fourth-most polluted major city in the world on Friday night. Rebecca Saari, the Canada Research Chair in Global Change, Atmosphere and Health, explains how people in those regions can protect themselves from potential health risks.

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