FILE- In this Sept. 14, 2001 file photo, a firefighter emerges from the smoke and debris of the World Trade Center in New York. A decade’s worth of study has answered only a handful of questions about the hundreds of health conditions believed to be related to the tons of gray dust that fell on the city when the trade center collapsed, from post-traumatic stress disorder, asthma and respiratory illness to vitamin deficiencies, strange rashes and cancer. (AP Photo/U.S. Navy, Photographer's Mate 2nd Class Jim Watson, File)

Associated Press
FILE- In this Sept. 14, 2001 file photo, a firefighter emerges from the smoke and debris of the World Trade Center in New York. A decade’s worth of study has answered only a handful of questions about the hundreds of health conditions believed to be related to the tons of gray dust that fell on the city when the trade center collapsed, from post-traumatic stress disorder, asthma and respiratory illness to vitamin deficiencies, strange rashes and cancer. (AP Photo/U.S. Navy, Photographer's Mate 2nd Class Jim Watson, File)
FILE- In this Sept. 14, 2001 file photo, a firefighter emerges from the smoke and debris of the World Trade Center in New York. A decade’s worth of study has answered only a handful of questions about the hundreds of health conditions believed to be related to the tons of gray dust that fell on the city when the trade center collapsed, from post-traumatic stress disorder, asthma and respiratory illness to vitamin deficiencies, strange rashes and cancer. (AP Photo/U.S. Navy, Photographer's Mate 2nd Class Jim Watson, File)
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