The largest study to date on human exposure to environmental chemicals
in the United States has found encouraging signs that levels of lead, pesticides,
and other chemicals in the body generally have declined over the past decade
or so. But the report, by researchers at the Centers for Disease Control and
Prevention (CDC), also raised concerns that children have blood or urine levels
of metabolites of tobacco smoke and pesticides that are substantially higher
than levels found in adults.
Stephenson J. CDC Report on Environmental Toxins. JAMA. 2003;289(10):1230-1233. doi:10.1001/jama.289.10.1230