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 ...
Source: [Phys.org](https://phys.org/news/2026-08-days-ontario-wildfire-brought-unhealthy.html)