Two friends of mine (both on Texas Task Force 1, a quick response group of Texas firefighters that go to disaster sites) pulled duty at the World Trade Center. One of them developed pneumonia related to the dust he inhaled. Doctors told him it would never go away, and he would probably develop cancer within five years. The other has started having balance problems related to some kind of inner ear problem, with no conclusion that I'm aware of that it was related to the WTC. He's been on disability and run out most of his sick leave.
wow...
yeah that concrete dust was some nasty looking stuff there, along with all of the other things floating around in the air as well....