Harvard study says air pollution linked to autism in children

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CAMBRIDGE, Massachusetts -  A study by Harvard School of Public Health say women who are exposed to high levels of air pollution in their last three months of pregnancy may be twice as likely to give birth to an autistic child.

The study focused on 1,767 children born between 1990 to 2002.  Among those, 245 were diagnosed with autism.

Many aren't sure what causes autism, but Harvard professor Marc Weisskopt said, "It's really the pollution doing it."

That's alarming news for Houston which ranked as the sixth most-polluted city in 2014 by the American Lung Association,