Abstract:The Physiologically Based Extraction Test (PBET) method was used to study the bioaccessibility of Cr, Mn, Cu, Zn, Cd and Pb in the dusts of fifteen bus stops from the Jianshe Street in Shijiazhuang, and the US EPA human health risk model was applied to assess the health risks of six heavy metals. The results showed that the concentrations of Mn and Cr in all stops did not exceed the background values of soil in Hebei Province, the concentrations of Cu, Zn, Cd and Pb in all stops exceeded the background values. Among the four heavy metals, Cd had the largest degree of enrichment. The bioaccessible concentrations of these heavy metals in gastric and intestinal stages were obviously different. Except that the bioaccessible concentration of Cr in the intestinal stage was larger than that in the gastric stage at the Yunhe Bridge stop, the bioaccessible concentrations of six heavy metals in the gastric stage were higher than that in the intestinal stage at all stops. The bioaccessibility of Cu, Zn, Cd, Pb, Mn and Cr at all stops were 40.57%~90.31%, 45.67%~77.57%, 61.03%~84.14%, 49.05%~82.99%, 59.46%~85.32% and 11.36%~54.17%, respectively. The hazard quotients (HQ) and the carcinogenic risks (CR) of children were higher than that of adults. The HQ of six heavy metals in all stops were less than 1, within the safety threshold values. The CR of Cr and Cd ranged from 1×10-6 to 1×10-4, at an acceptable level. The CR of Pb were less than 1×10-6 at various stops, which could be ignored.