Doctor on how concerning wildfire smoke is for health

Millions of Americans across the Northeast and Midwest were under air quality alerts this week as smoke from Canadian and Minnesota wildfires settled in. At the same time, some of those same areas saw severe heat. CBS News medical correspondent Dr. Céline Gounder has more.

Millions of Americans across the Northeast and Midwest were under air quality alerts this week as smoke from Canadian and Minnesota wildfires settled in. At the same time, some of those same areas saw severe heat. CBS News medical correspondent Dr. Céline Gounder has more.