Extent of Exposure

The exposure zone for the New York City World Trade Center site is all of lower Manhattan south of Canal Street from the Hudson River to the intersection of Canal Street and East Broadway, north on East Broadway to Clinton Street, and east on Clinton Street to the East River. The sufficiency of exposure depends on your individual circumstances, including your location, nature of work, when you first arrived on site, and the duration of presence. A minimum number of hours present for cancer to develop is 4 hours or being directly in the dust cloud for any length of time.