Street dusts of different functional areas from Chengdu, SW China are analyzed for Cu, Pb, Zn, Mn, Co, Ni, Cr and Cd. The results show that, in comparison with the background values of Chengdu and Chinese soils, the mean concentrations of all heavy metals are all higher than their corresponding background values of Chengdu soil and Chinese soil except Co and the street dusts from seven functional areas have different cumulative characteristics. Meanwhile, the value of Ige〇, PI, IPI and RI are calculated. The results indicate that the order of Ige〇 is C d>Pb> Cu>Zn>Ni>Cr>Mn> C o and the Ige〇 of heavy metals in the dust from TD and ID is higher than in other functional areas. The high Ige〇 for Cu, Pb, Zn, Ni and Cd in street dusts indicate that there is a moderate or strong Cu, Pb, Zn, Ni and Cd pollution. I^e〇 for Mn, Co and Cr are less than 0, indicating that the urban environment was scarcely contaminated by Mn, Co and Cr. The assessment results of PI also support Cu, Pb, Zn, Ni and Cd in street dusts presented serious pollution, and IPI indicates heavy metals of street dust polluted seriously. the RI values of heavy metals indicate the heavy metals of street dusts are considerable ecological risk or very high ecological risk and Cu, Pb and Cd are the main contributors to the potential ecological risk, especially Cd.
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