The forest fires that have swept through northwestern Ontario in Canada over the past few days have caused air quality in many parts of the country to deteriorate dramatically, and rail traffic has been blocked. Affected by wildfires and haze, Canada's largest city, Toronto, ranked at the bottom of the world's major air quality indicators on the morning of the 15th. According to data released by the Canadian Ministry of the Environment, the city of Toronto's air quality health index was at a “high risk” level that day. The capital Ottawa also triggered an air quality warning due to heavy smoke from wildfires and high humidity and heat. The high humidity caused smoke particles to stay in the air, and the sky was yellow.

The forest fires that have swept through northwestern Ontario in Canada over the past few days have caused air quality in many parts of the country to deteriorate dramatically, and rail traffic has been blocked. Affected by wildfires and haze, Canada's largest city, Toronto, ranked at the bottom of the world's major air quality indicators on the morning of the 15th. According to data released by the Canadian Ministry of the Environment, the city of Toronto's air quality health index was at a “high risk” level that day. The capital Ottawa also triggered an air quality warning due to heavy smoke from wildfires and high humidity and heat. The high humidity caused smoke particles to stay in the air, and the sky was yellow.