From OEHHA:

Pregnant women who are African-American or nonsmokers are more likely to have miscarriages if they live near heavy traffic, according to a new state study.

Researchers examining health-care data on nearly 5,000 pregnant women in California found that African-Americans were about three times more likely to miscarry if they lived within a half-block of a freeway or busy boulevard than if they resided near lighter traffic. Among nonsmokers, living near busy roads increased their odds of miscarriage about 50 percent.

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