amp; Safety (ANSES) and the German Environment Agency (UBA), above which possible adverse health effects may be expected. We estimated that up to 20.6% of Slovak children and up to 45.7% of Czech children at two years of age exceeded the threshold value of 700 ng.g(lipid)(-1 )in blood. Mean TEDIs leading to values of 500 ng.g(lipid)(-1) in blood for children up to two years ranged between 110 and 220 ng.kg(-1).bw.day(-1), varying according to breastfeeding duration. Breast milk and prenatal exposure contributed to 71 %-85% of PCBs exposure at two years of age. In contrast, the contributions of PCBs fmm dust and indoor air were negligible.