In order to study the heavy metals contamination of street dusts in core zone of Chongqing city

the total contents and extracted heavy metal content by simulated acid rain of As

Cd

Cr

Cu

Hg

Ni

Pb

Zn were analyzed

meanwhile

corresponding properties including pH

organic matter(OM)

total nitrogen(TN)

total phosphorus(TP) and total potassium(TK) were also analyzed.The results showed that: (1) in different functional zone

the medium size particle account for about 50% of the total street dust.The contribution of different size particle to heavy metal content as follows: for different element

the finer the particle

the greater the contribution is

but for different functional zone

the medium size particle almost has the same contribution as the finest particle;(2) the street dust were alkaline and had potential organic pollution;(3) the total heavy metal contents of street dusts in Chongqing had great difference

and the elements seriously influenced by people were Cr

Cd

Hg and Cu;(4) the Nemerow comprehensive index indicated that the street dusts were contaminated by seven kinds of heavy metals except for Ni

while all functional zones were polluted seriously;(5) the total heavy metal contents of street dusts in Chongqing only had remarkably positive correlation with TP.