the researchers found,
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.
That average birth weight may have responded to such a short bout of clean air makes you wonder what pollution is doing to fetuses who experience it for all 40 weeks. “Even in this 47-day period you see a public health benefit like this,” Rich says. “Imagine what you could do if you could have air pollution levels reduced throughout the whole entire pregnancy.”
The timing of the pregnancy seemed to matter. The researchers found that baby weight went up when clearer skies coincided with the eighth month of pregnancy, a time when a fetus is really packing on pounds. Finding an effect there “makes a lot of sense,” says epidemiologist Beate Ritz of the University of California, Los Angeles, who wasn’t involved in the study.
Twenty-three grams — about 0.8 ounces — isn’t a big difference. In fact,
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, it’s less than 1 percent of these babies’ median weight. But that slight change may serve as a bellwether for more insidious effects.
“It’s really important,
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, not so much as ‘Oh,
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, those few grams, do they really matter in the life of this child?’’ Ritz says. “That’s not really what we’re asking.” Instead,
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, scientists suspect that if pollution is behind the weight difference,
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, then dirty skies could be inflicting damage on other developing organs and systems too. Pollution during pregnancy could be programming these babies to develop in a way that leads to important differences in the immune system,
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, the brain and other systems, she says.
It’s also possible that pollution might do more damage earlier in pregnancy,
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, Ritz says. Dirty

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