02:36
Wildfires in Canada continue to burn, sending curtains of haze across broad swaths of the country and the neighboring United States for weeks. Canadian officials say it is the nation's worst wildfire season ever and that they expect air quality to remain a concern through the summer once the fires continue.
Meanwhile, NASA is reporting that smoke from wildfires in northern Quebec has reached Europe. It said satellite imagery from July 3 showed smoke traveling across the North Atlantic Ocean to the Iberian Peninsula, France and other parts of western Europe.