Even low levels of air pollution may raise risk of low birth weight

From Health Day News (10/15):

In a review of 14 studies involving more than 74,000 women, researchers found that all types of air pollution, particularly fine particulate matter, were associated with higher risk of having babies with low birth weight and smaller head circumference. For every increase of 5 micrograms per cubic meter in pregnant women's exposure to fine particulate matter, the likelihood of having a low birth weight infant rose by 18%, according to the review published in The Lancet Respiratory Medicine.

http://consumer.healthday.com/respiratory-and-allergy-information-2/air-pollution-health-news-540/briefs-emb-10-14-6-30pmet-air-pollution-birth-weight-lancet-rm-release-batch-969-681073.html