Autism linked to higher smog levels, study says

This new study—which does not establish a direct connection between
dirty air and autism—did not find a statistically significant increased
risk for autism related to air pollution exposure at any specific time during pregnancy.

Instead, the authors found a child's odds of autism were 1.5 times
greater when air pollution exposure was greater across the entire span
of time from pre-pregnancy until the child was 2 years old.

"These findings are striking because they suggest that cumulative
exposures over the course of the pregnancy may be important, as opposed
to any individual period during the pregnancy," said study author Evelyn
Talbott, a professor of epidemiology at the University of Pittsburgh.
But more research would be necessary to understand how pollution might
affect autism risk, she said.

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