FILE- In this Sept. 11, 2001 file photo, a shell of what was once part of the facade of one of the twin towers of New York's World Trade Center rises above the rubble that remains after both towers were destroyed in the terrorist attacks. 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/Shawn Baldwin, File)

Associated Press
FILE- In this Sept. 11, 2001 file photo, a shell of what was once part of the facade of one of the twin towers of New York's World Trade Center rises above the rubble that remains after both towers were destroyed in the terrorist attacks. 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/Shawn Baldwin, File)
FILE- In this Sept. 11, 2001 file photo, a shell of what was once part of the facade of one of the twin towers of New York's World Trade Center rises above the rubble that remains after both towers were destroyed in the terrorist attacks. 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/Shawn Baldwin, File)
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