07 Dec 2012,
Researchers at the Keck School of Medicine at the University of SouthernCalifornia examined data from the Childhood Autism Risks from Geneticsand the Environment study of more than 400 children, 279 of whom areaffected by autism.
To estimate a child's exposure to traffic air pollution before birth andduring their first year of life, researchers looked at records on thelevels of pollution at a mother's address. They found that childrenexposed to air pollution had more than a twofold risk of autism. Even ifmothers didn't live near a busy road but in a region with poorer areaquality there was an increased risk.