Smoke from out-of-control Canadian wildfires drifts into US skies

Parts of the United States are now seeing smoke from out-of-control wildfires in western Canada, triggering air quality alerts in parts of many central and western states. Experts warn the smoke will move further east to places like Chicago and St. Louis and could linger for days. Chris Stockdale, a forest fire research officer with the Canadian Forest Service, has more.