Elevated blood lead levels in pregnant women, even those well below the US Centers for Disease Control and Prevention's 10 ug/dL "level of concern", can cause miscarriage, premature birth, and LBW in the offspring. Exposure of pregnant women to airplane noise was found to be associated with low birth weight via adverse effects on fetal growth. Prevalence of low birth weight in Japan is associated with radiation doses from the Fukushima accidents of March 2011.