Smoke from wildfires in northwestern Ontario is drifting south, leading to poor air quality in Toronto and southern Ontario.Environment Canada has issued warnings that this condition may persist until Thursday, with symptoms like throat irritation, headaches, and coughs reported.The warnings cover areas from Thunder Bay to Kingston and London, coinciding with mandatory evacuation orders for several First Nations communities.Extreme heat from a second-day heatwave, with humidex values reaching 45°C, compounds the health risks.Authorities advise limiting outdoor activity and prioritizing cooling measures.

The situation highlights the intersection of environmental hazards, public health, and community safety, with ongoing efforts to manage both wildfire impacts and heat-related emergencies.