How Canadian wildfires are worsening U.S. air quality and what you can do to cope

A person jogs through a Brooklyn park on a hazy morning resulting from Canadian wildfires on June 6 in New York City. (Spencer Platt/Getty Images)

Dozens of wildfires are burning in the Canadian province of Québec, and the smoke is so bad that it's causing air quality problems across large swaths of the U.S.

The National Weather Service said air quality has "plummeted" across the Northeast.