Mercury(Hg)ranks number three,after arsenic(As)and lead(Pb),on the Substance Priority List of the Agency for Toxic Substances and Disease Registry(ATSDR,2019).Mercury species,especially methylmercury(MeHg)and mercury vapor(Hg0),are particularly toxic to neurological and developmen-tal systems.Exposure to high concentrations of methylmer-cury or mercury vapor can cause damages to the brain,kid-neys,and developing fetus.Exposure to lower concentrations of mercury may also have adverse health effects on fetal growth,neurocognitive function,and the cardio-vascular sys-tem(Karagas et al.,2012).