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SAN FRANCISCO, CA - MARCH 26: Firefighter boots line the stairs inside San Francisco City Hall during a remembrance ceremony held for San Francisco firefighters who have died of cancer on March 26, 2014 in San Francisco, California. Over two hundred pairs of boots were displayed on the steps inside San Francisco City Hall to symbolize the 230 San Francisco firefighters who have died of cancer over the past decade. According to a study published by the National Institute for Occupational Safety and Health, (NIOSH) findings indicate a direct correlation between exposure to carcinogens like flame retardants and higher rate of cancer among firefighters.
The study showed elevated rates of respiratory, digestive and urinary systems cancer and also revealed that participants in the study had high risk of mesothelioma, a cancer associated with asbestos exposure. (Photo by Justin Sullivan/Getty Images)