The Firefighter Occupational Exposures - FOX Project is a study of environmental chemical exposures in firefighters.  This study was conducted in partnership with the University of California Irvine’s Center for Occupational and Environmental Health (UCI COEH) and a Southern California fire department.  UCI COEH provides study updates to the fire department on a quarterly basis.  Firefighters were chosen because they are likely to be exposed to many toxic chemicals in the performance of their duties.  Questionnaire information and blood and urine samples were collected in 2010-2011 from 101 firefighters in Southern California.