Dr. Sanjay Gupta reports on effects of toxic dust exposure from NYC’s 9/11 Ground Zero during memorial coverage

CNN chief medical correspondent Dr. Sanjay Gupta discusses the health hazards associated with the dust from the collapse of the World Trade Center towers ten years ago with CNN anchors Anderson Cooper and Candy Crowley.  Several rescue workers who worked on “the pile” at New York’s Ground Zero following the attacks on the city on 9/11/2001 have developed health symptoms associated with exposure to the dust during their efforts to retrieve survivors and recover bodies.