Millions of people in North America have been warned about the health risks of poor air quality, as toxic wildfire smoke from Canada drifts ... areas around the world. AQI indicates how clean ...

Health officials have warned of medium to high smoke risk in cities across Canada, including Calgary, Montreal, Quebec and Toronto. US regions with an AQI over 150 on Tuesday afternoon included ...

The Wisconsin Department of Natural Resourcesoffered a more complete picture of exactly how the Canadian wildfires in 2023 ...