Our estimate for the decrease in term birth weight associatedwith entire pregnancy PM10 exposure (for an increase of 10 mg/m3:24.0 g, 95% CI: 20.9, 27.2 g) is considerably higher than estimates from previous studies. A meta-analysis including 7 studies (Stieb et al., 2012) showed a significant decrease in birth weight of 16.8 g(95% CI: 13.3, 20.2 g) as entire pregnancy PM10 exposure increased