Mount Sinai School of Medicine in New York, in collaboration with the Environmental Working Group and Commonweal, found 167 chemicals, pollutants, and pesticides in the blood and urine of nine adult Americans. The subjects contained an average of 91 compounds each - most of which did not exist 75 years ago. For two-thirds of the chemicals found, many of which are banned, researchers have only partially studied the extent to which these chemicals can harm human health.