Associations specifically with PM2.5 from industrial sources are less studied, but most of the studies [12, 19–25] found PM2.5 inducing ABO: LBW [12, 21–24], PTB [21–23, 25], SGA [12, 21, 25], TLBW [12, 25], and IUGR [19, 20]. The gene discussed is ABO; the disease is fetal growth restriction.