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Survey finds elevated rates of new asthma among WTC rescue and recovery workers
Date:8/27/2007

Findings released today by the Health Department shed new light on the health effects of exposure to dust and debris among workers who responded to the World Trade Center disaster on September 11, 2001. The data, drawn from the World Trade Center Health Registry, show that 3.6% of the 25,000 rescue and recovery workers enrolled in the Registry report developing asthma after working at the site. That rate is 12 times what would be normally expected for the adult population during such a time period. The paper was published today in the journal Environmental Health Perspectives and is available online at www.ehponline.org.

The rescue and recovery workers are a subset of the 71,000 people enrolled in the registry. The survey, conducted in 2003 and 2004, found that arriving soon after the buildings collapsed, or working on the WTC pile over a long period, increased the workers risk of developing asthma. Workers who arrived on September 11, 2001, and worked more than 90 days reported the highest rate of new asthma (7%).

Though respirator use increased as the clean-up progressed, many workers did not wear respiratory protection at the outset. Certain respirators can reduce exposure to hazardous dust when used correctly, but the survey could not distinguish among different types of masks or respirators, nor could it gauge correct usage. Workers who wore them on September 11th and September 12th reported newly-diagnosed asthma at lower rates (4.0% and 2.9%, respectively) than those who did not (6.3% and 4.5%). The longer the period of not wearing masks or respirators, the greater the risk, the survey found. Workers who went months without respiratory protection reported two to three times more asthma incidence than those who wore respirators from the outset. Though respirators were shown to be protective, all worker groups, including those who reported wearing masks, had elevated levels of newly reported asthma.

The dust from the World Trad
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Contact: Geoffrey Cowley
gcowley@health.nyc.gov
212-788-5290
New York City Health Department
Source:Eurekalert

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