The Fourth National Report on Human Exposure to Environmental Chemicals, 2009 (the Report) provides an ongoing assessment of the exposure of the U.S. population

The Fourth Report uses a new procedure to estimate percentiles when the percentile estimate falls on a value that is repeated multiple times (e.g., five results

This report presents biomonitoring exposure data for 116 environmental chemicals for the noninstitutionalized, civilian U.S. Population over the 2-year period 1