More than 400 wildfires are now burning in the Canadian province of Quebec.
Fires have been burning across the country for weeks,.
And the smoke is travelling south, triggering air quality alerts for people in parts of the United States.
New York City's Mayor has urged residents with heart or breathing problems to limit outdoor activities.
Tens of millions of people under air quality warnings as wildfires continue to burn throughout Canada
Some cities including Toronto and New York briefly had the worst air quality in the world on Wednesday.
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