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And so that makes the particles which are already toxic, even more toxic,” said Ana Navas-Acien, environmental health sciences chair at Columbia University’s Mailman School of Public Health.

Dr. Helen Blair Simpson is a psychiatry professor and O.C.D. researcher at Columbia University.

Dr. Uma Reddy, who led NY-CHAMP’s work, said that the interventions carried out by her team probably saved taxpayers money.

Editor's Note: David Brenner, interviewed for this story, is director of the Center for Radiological Research at the Columbia University Vagelos College of Physicians and Surgeons.