Meanwhile, NYC’s Mayor Eric Adams warned that the authorities “recommend all New Yorkers limit outdoor activity to the greatest extent possible” and people in North America have been advised to wear N95 masks outdoors.
There are more than 400 wildfires raging in Canada which have led to mass evacuations in Quebec province.
While some predictions said NYC might get some relief by Thursday evening, US National Weather Service meteorologist Bryan Ramsey said "conditions are likely to remain unhealthy for at least the next few days", with no end in sight for the wildfires.
The city’s health commissioner Ashwin Vasan told reporters on Wednesday that the city’s air quality is at its worst since the 1960s, with conditions expected to last through several days.
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