Paul J. Lioy, an environmental scientist who studied the toxins in World Trade Center dust and was one of the few to take samples of the substance in the early days after the terrorist attacks, died suddenly July 11 of unknown causes at age 68.
Mr. Lioy was the deputy director for government relations at the Environmental and Occupational Health Sciences Institute, a joint program with Rutgers University and the Robert Wood Johnson Medical School. He directed the institute’s program in exposure science, a field that examines human interactions with outside chemical, biological and physical substances.
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