Air pollution is linked to both preterm birth and low birth weight.

Exposure to air pollution has been identified as a significant cause of both preterm birth and low birth weight. Each year, air pollution attributes to about 16,000 babies born too early in the U.S.

What does preterm birth and low birth weight mean?

Babies born too early, before 37 weeks, are considered preterm. Babies born too small, 5.5 lbs or less are considered low birth weight. These infants are more likely to die before their first birthday.