Prenatal exposure to a toxic pollutant is associated with a lower intelligence quotient in children, according to a study in the August issue of the journal Pediatrics, released July 20.rnIn the study, "Prenatal Airborne Polycyclic Aromatic Hydrocarbon Exposure and Child IQ at Age 5 Years," researchers from Columbia University and the Southwest Research Institute studied nonsmoking women from Washington Heights, Harlem, or the South Bronx in New York City who had been recruited into the study between 1998 and 2003. The mothers were monitored for exposure to polycyclic aromatic hydrocarbons throughout their pregnancies.
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