Ambient air pollution the risk of stillbirth: A prospective birth cohort study in Wuhan, China.

Our study revealed that exposure to high levels of PM, PM, SO, NO and CO increases the risk of stillbirth and the most susceptible gestational period to ambient air pollution exposure was in the third trimester. Further toxicological and prospective cohort studies with improved exposure assessments are needed to confirm the causal link between air pollutants and stillbirth.