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The New York Times [http://www.nytimes.com/2007/08/28/nyregion/28registry.html reports today]:

Rescue and recovery workers at ground zero have developed asthma at a rate that is 12 times what would be expected for adults. ...

Of nearly 26,000 workers surveyed in 2003 and 2004, 926 reported that they developed asthma for the first time after working at ground zero (a rate of 3.6 percent). In a group that size, under normal conditions, no more than 77 new cases of asthma (0.3 percent) would have been expected, according to the report, which is published in the current issue of Environmental Health Perspectives, a science and health journal.