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对重庆市６个主要交叉路口大气中铅浓度进行测定，同时对１２８名在上述地区值勤交警发铅值进行监测，并以１０７名大学生发错值作对照。结果表明交警发铅值高于对照，随大气铅浓度增高、交警工龄增长而增高。
The concentrations of lead in six major intersections in Chongqing city were measured, and the lead value of 128 traffic policemen in these areas was monitored at the same time. The results show that traffic police issued a higher value of lead than the control, with the concentration of lead in the atmosphere increased traffic police increased the length of service.