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Three days of Ontario wildfire smoke brought unhealthy air to 106 million person-days

phys.org · 3h · first reportShare

Smoke from Canada's July wildfires exposed people across Canada and the United States to unhealthy, very unhealthy or hazardous air for nearly 106 million person-days between July 15–17. Over the peak impact period of July 13–18, moderate or worse air quality accounted for more than 769 million person-days. For a period, Toronto recorded the poorest air quality of any major city in the world.