The results showed that concentrations of PM10 > 40 μg/m3 in the first gestational month significantly increased IUGR (Dejmek et al., 1999). In addition, IUGR was increased when concentrations of c-PAHs in the first gestational month >15 ng/m3 (B[a]P 2.8 ng/m3) (Dejmek et al., 2000).