Prenatal exposure to traffic-related air pollution and fetal growth in a cohort of pregnant women.

Objectives: Scant evidence is available on effects of air pollution on longitudinally measured fetal biometry, and thus it remains unclear as to whether there are critical windows of exposure or specificity of effects. Our objective was to examine the association between exposure to nitrogen dioxide (NO2) during pregnancy and fetal and neonatal anthropometry in a cohort of Spanish women.

Methods: Temporally adjusted land-use regression was used to estimate exposure to NO2 at home addresses.