Objective To investigate the blood lead level and its related factors in children in Chongqing and to provide evidence for the prevention and treatment of lead contamination. Methods In June 2001, the blood lead levels in 173 children(aged 2~7 2 years old) selected from 2 kindergartens representing the children in urban district and suburb were detected. At the same time, the related factors were investigated by using questionnaires. Results The highest, the lowest and the mean blood lead levels were 27...