Wildfire smoke engulfs millions in US ahead of World Cup final

Dense wildfire smoke from out-of-control fires in Canada triggered unhealthy air quality alerts across the US, with Detroit and Chicago rated 'hazardous' and Washington at 'very unhealthy.' Forecasts suggest smoke may thicken again Saturday morning, but meteorologists believe air quality on Sunday for the World Cup final in New Jersey will not be as severe. Weekend rain could also help alleviate the smoke.