CDC - National Report on Human Exposure to Environmental Chemicals

The Fourth National Report on Human Exposure to Environmental Chemicals 2009 and the Updated Tables, February 2011, together are the most comprehensive assessment of environmental chemical exposure in the U.S. population. Since 1999, CDC has measured 219 chemicals in people's blood or urine. The Fourth Report, 2009, includes the findings from national samples for 1999-2000, 2001-2002, and 2003-2004.
The blood and urine samples were collected from participants in CDC's National Health and Nutrition Examination Survey (NHANES), which obtains and releases health-related data from a nationally representative sample in two-year cycles.