Hazy skies over northern US cities as wildfires rage in Canada
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Forest fire smoke in Canada pushed the New York air quality index at 123 at noon on Monday, Buffalo reaching an unhealthy 152.
The mist has caused warnings for sensitive groups, including children, the elderly and respiratory or cardiac people to stay inside.
At least 760 forest fires burn nationally in Canada, with officials saying that more than 16.8 billion acres (6.8 million hectares) have so far burned this year. At least 205 fires are deemed out of control.
