Children's IQ can be affected by mother's exposure to urban air pollutants

Children's IQ can be affected by mother's exposure to urban air pollutants  
http://www.eurekalert.org/pub_releases/2009-07/cums-cic072009.php

"Prenatal exposure to environmental pollutants known as polycyclic aromatic hydrocarbons (PAHs) can adversely affect a child's intelligence quotient or IQ, according to new research by the the Columbia Center for Children's Environmental Health (CCCEH) at the Mailman School of Public Health. PAHs are chemicals released into the air from the burning of coal, diesel, oil and gas, or other organic substances such as tobacco. In urban areas motor vehicles are a major source of PAHs. The study findings are published in the August 2009 issue of Pediatrics."