•    Cu, Zn, Cd and Pb contents in street dust of 3806 sites throughout China were obtained.
•    Traffic and industrial emissions were two main sources of heavy metals in street dust.
•    Heavy metal contents and health risks showed spatial distributions with decreasing from southeast to northwest.
•    Health risks posed by Pb should merit more attention and priority control.
•    Children should be given the priority of protecting against heavy metal pollutionin street dust.


Bobak [CC BY-SA 2.5 (https://creativecommons.org/licenses/by-sa/2.5)], from Wikimedia Commons

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Photo Credit:  Bobak [CC BY-SA 2.5 (https://creativecommons.org/licenses/by-sa/2.5)], from Wikimedia Commons