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Toronto's air quality is the worst in the world due to wildfires in Northern Ontario

Toronto's air ranked as the worst among major cities worldwide on Wednesday as smoke from wildfires in northwestern Ontario darkened skies and prompted residents to limit outdoor activity as temperatures continued to rise. Environment Canada reported that Toronto's Air Quality Health Index (AQHI), which is classified as "very risky," was 10+. Forecasts indicated that hazardous conditions might persist until Thursday night.

IQAir, a Swiss company that specializes in air quality, ranked Toronto the world's worst city for air quality, beating out Kinshasa, Delhi, and other cities.

In recent years, wildfire smoke from Canada's north has spread to large areas of the United States. This has prompted health warnings for the elderly and infants who are more sensitive to smoke particles.

A video of a Canadian National train burning near Armstrong, Ontario was shared on social networks. Canadian National announced that it had temporarily suspended rail operations in the vicinity of Armstrong, Ontario as a precautionary measure due to wildfires. CN said that residents and employees of the area were evacuated 'Monday night.

The Government of Canada said that the wildfire season started more slowly in 2026 compared to?2023 or?2025 - the two worst seasons for wildfires - but warned that the fires are likely caused by warmer temperatures than usual across the country.

According to the government, there were 835 fires burning across the country as of Wednesday. Of those, 112 were considered out-of-control. As of today, 1.9 millions hectares (4.7million acres) have been burned. The majority of fires occurred in central provinces such as Manitoba, Saskatchewan and Ontario.

Greg Evans, Professor at University of Toronto Chemical Engineering & Applied Chemistry said that it was the first time he could recall the city being simultaneously affected by severe heat and smoke from wildfires.

He said that he expects this to happen more often in the coming decades, so residents and cities should prepare themselves for the future.

Paula Oreskovich is a Toronto resident who said that she noticed the haze, and smell of smoke, when she went outside in morning. She expressed concern about the air quality, especially since wildfire smoke is a frequent feature of summers in recent years.

"I think you would be foolish to ignore climate change. Oreskovich stated that climate change is a reality.

Toronto was also hit by extreme heat in the past few days. Environment Canada issued a heat alert for the city, predicting a high temperature of 33 degrees Celsius (91 Fahrenheit) with humidity that made temperatures feel closer to 39 C.

Environment Canada issued an advisory stating that "reduce or reschedule any strenuous outdoor activities, especially if symptoms like coughing and throat irritation are present."

IQAir reported a U.S. Air Quality Index of 184 in the city. This is a level that is considered unhealthy. (Editing by Caroline Stauffer, Nick Zieminski and Ed White from Winnipeg)

(source: Reuters)