The situation of lead contamination in children Among 403 children in final analysis, including 195 children in Ban Thi, Bac Kan and 208 children in Tan Long, Thai Nguyen, there were 80.51% of children having BLLs in the range of 10 - 45 µg / dl and no one had BLLs above 45 µg / dl in Ban Thi, while 50% and 1.92% children having blood lead concentration of 10 - 45 µg / dl and > 45 µg / dl, respectively, in Tan Long.