World Trade Center disaster: assessment of responder occupations, work locations, and job tasks.

Background: To date there have been no comprehensive reports of the work performedby 9/11 World Trade Center responders.

Methods: 18,969 responders enrolled in the WTC Medical Monitoring and Treatment Program were used to describe workers’ pre-9/11 occupations, WTC work activities and locations from September 11, 2001 to June 2002.

Results: The most common pre-9/11 occupation was protective services (47%); other common occupations included construction, telecommunications, transportation, and support services workers.