Watch: Wildfire smoke blankets cities across U.S., Canada

Heavy smoke from wildfires in Canada and Minnesota is engulfing parts of the U.S., prompting air quality alerts in 18 states. These videos show the hazy conditions on the ground in several cities.

Heavy smoke from wildfires in Canada and Minnesota is engulfing parts of the U.S., prompting air quality alerts in 18 states. These videos show the hazy conditions on the ground in several cities.