Paul J. Lioy, an environmental scientist widely known for his analysis of the dust spawned by the Sept. 11 attacks on the World Trade Center and for his studies of its health effects over time, died on Wednesday after collapsing at Newark Liberty International Airport. He was 68. The cause had not been determined, his wife, Jean Lioy, said. More.
Paul Lioy, Scientist Who Analyzed 9/11 Dust and Its Health Effects, Dies at 68