Pregnant women who live in smog-filled areas may be twice as likely to have children with autism, a new study suggests.

Exposure to diesel particulates, lead, manganese, mercury, methylene chloride and other pollutants are known to affect brain function and have influence of the development of the baby.

The study was a long-term study starting 1989 at Brigham and Woman's Hospital, 116,430 nurses where involved.

22,000 woman who had a child without the disorder and 325 who had a autism child were studied.

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