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Canadian wildfire smoke chokes Toronto and threatens US cities

Toronto's air quality was the worst in the world on Wednesday, as smoke from wildfires in?northwestern?Ontario smoldered the skies and spread to the northeastern United States. Residents were warned about their health and asked to limit outdoor activity. 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.

New York City started feeling the effects a few days before the World Cup Final in New Jersey on Sunday. Local authorities issued a warning when air quality reached a dangerous level. They urged residents to reduce "strenuous outdoors activity" on Wednesday and Thursday and to take extra breaks. Smoke could persist into the weekend, according to the National Weather Service. IQAir, a Swiss company that specializes in air quality, ranked Toronto the world's worst city for air pollution, beating out Kinshasa, Delhi, and other cities. New York was ranked No. 5. In recent years, wildfire smoke from Northern Canada was a frequent summer event across large swaths in the United States. The video of a Canadian National train being engulfed in flames near Armstrong, Ontario that was shared on social networks went viral. Residents of Armstrong and Canadian National employees were evacuated from the area on Monday night. As a precaution, the company suspended rail operations in Armstrong, which is more than 500 kilometers north of Toronto. A poor air quality forced the City of Toronto to cancel the FIFA Fan Festival at Nathan Phillips Square and the England-Argentina World Cup Watch Party. More than 80,000 New Yorkers are expected to watch the World Cup Final in an open-air stadium located in New Jersey, on Sunday. Central Park, in Manhattan's hazy skies, will host another 50,000 people to watch the World Cup final.

New York State Governor Kathy Hochul stated on social media that smoke from Canadian wildfires was creating unhealthy air conditions in the state. She encouraged people to be cautious, especially those who have health problems.

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 due warmer temperatures than usual across the country.

According to the government, 835 fires were burning across the country on Wednesday. Of those, 112 were considered out-of-control. So far, the fires have spread over 4.7 million acres (1.9 million hectares). The majority of fires occurred in central provinces such as Manitoba, Saskatchewan and Ontario.

Greg Evans, professor of Chemical Engineering & Applied Chemistry at the University of Toronto, said that Toronto was simultaneously affected by severe?heat' and wildfire smoke.

He said, "I anticipate that this will happen more often in the coming decades. Cities and residents should prepare for it."

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

"You have to be stupid if you don't care about climate change," said Oreskovich. Oreskovich stated that climate change is a fact.

(source: Reuters)