Ontario wildfire smoke exposed millions to unhealthy air across Canada and US

Data shows that smoke from Canadian wildfires in July exposed residents across Canada and the United States to unhealthy air for nearly 106 million person-days.

• Wildfire smoke exposed people to unhealthy or hazardous air for 106 million person-days between July 15-17.
• Toronto briefly recorded the poorest air quality of any major city in the world during the peak period.