Hazy skies seen over US cities as wildfires rage in Canada

Smoke from wildfires in Canada pushed New York's Air Quality Index to 123 by midday Monday, with Buffalo reaching an unhealthy 152.

The haze has prompted warnings for sensitive groups including children, the elderly, and those with respiratory or heart conditions to stay indoors.

At least 760 wildfires are burning nationwide in Canada, with officials saying more than 16.8 billion acres (6.8 million hectares) have burned so far this year. At least 205 fires are deemed out of control.