Abstract: The concentration of Pb in dust samples collected from surrounding environment of a lead-zinc plant in Changqing Town, Baoji City was measured by X-ray fluorescence spectrometry, and the pollution index and human health risk assessment were used to assess the pollution of Pb in dust. The results show that the average concentration of Pb in dust was 2 631.13 mg/kg, it was higher than that reported in other references about urban street dust. The assessment results of lead pollution index show that the Pb pollution level in dust was different from different sites around the lead-zinc plant. Pollution of most samples was very serious. The human health risk assessment shows that contact was the main ingestion behavior. Both the exposure risk through contact ingestion and the total harmful index of children were higher than 1, which reveals that pollution of lead in dust is very harmful to children's health.

Key words: dust, lead, pollution index, human health risk, lead-zinc plant, Changqing Town, Baoji City