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Spatial distribution and isotope signature of mercury (Hg) in street dusts across China were investigated by collecting dust samples from 14 cities and reviewing previously published data from an additional 46 cities. Potential sources of street dust and the associated health risks to humans were also assessed. The total Hg (THg) concentrations in street dust ranged from 0.020-39.1 mg kg-1 with an average of 0.433 ± 0.185 mg kg-1 in the 60 cities. Street dust samples collected from 14 cities were characterized by slightly negative δ202
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