Toronto is currently experiencing the worst air quality globally due to smoke from over 100 active wildfires raging in northern Ontario. Environment Canada has issued health warnings as a result of the dangerously poor conditions. A thick, yellow haze has descended upon the city, and similar conditions are being reported across the northeastern United States. IQAir, a Swiss technology company specializing in air quality monitoring, ranked Toronto as having the worst air quality worldwide on Wednesday. The smoke is posing a health risk to residents, particularly those with respiratory issues. Authorities are advising people to take precautions and limit outdoor activities. The situation is ongoing as firefighters continue to battle the widespread blazes.