As Canadian wildfires continue to burn out of control, toxic air has floated down into the U.S., causing health alerts in many cities.

Officials from the Midwest to the East Coast and as far south as North Carolina are warning residents to take precautions as the hazy smoke poses a risk to public health.

So far this year, there have been 2,214 wildfires across Canada, according to Minister of Emergency Preparedness Bill Blair. The blazes have burned 3.3 million hectares — or more than 8 million acres.



With rain forecasted for some areas later this week, the hope is that it will help smother the fires.



New York City.


Philadelphia. Photo by Mackenzie H. Quinn.