Heavy metals are dangerous because they tend to be bioaccumulated, meaning that over a
long time the concentrations of heavy metal within a biological organism can be higher than that in the
environment. Therefore, the study of road dust is an important way of determine the origin, distribution
and level of heavy metals. In fact, chronic problems associated with long-term heavy metal exposures are
metal lapse caused by Pb exposure; Cd has effects on the kidney, liver and gastrointestinal tract [4].
According to numerous studies, the pollution sources of heavy metals in environment are mainly derived
from anthropogenic sources. For urban soils and dusts, the anthropogenic sources of heavy metals include
traffic emission ( vehicle exhaust particles, tire wear particles, weathered street surface particles, brake
lining wear particles), industrial emission ( power plants, coal combustion, metallurgical industry, auto
repair shop, chemical plant, etc.), domestic emission, weathering of building and pavement surface,
atmospheric deposited and so on[5, 6]. For example, Pb, Zn, and Cu largely come from traffic pollution,
whereas Ni is correlated to naturally occurring sources, Cd originates from industrial contaminants, and
Cr is associated with atmospheric deposition
Heavy metals are dangerous because they tend to be bioaccumulated, meaning that over along time the concentrations of heavy metal within a biological organism can be higher than that in theenvironment. Therefore, the study of road dust is an important way of determine the origin, distributionand level of heavy metals. In fact, chronic problems associated with long-term heavy metal exposures aremetal lapse caused by Pb exposure; Cd has effects on the kidney, liver and gastrointestinal tract [4].According to numerous studies, the pollution sources of heavy metals in environment are mainly derivedfrom anthropogenic sources. For urban soils and dusts, the anthropogenic sources of heavy metals includetraffic emission ( vehicle exhaust particles, tire wear particles, weathered street surface particles, brakelining wear particles), industrial emission ( power plants, coal combustion, metallurgical industry, autorepair shop, chemical plant, etc.), domestic emission, weathering of building and pavement surface,atmospheric deposited and so on[5, 6]. For example, Pb, Zn, and Cu largely come from traffic pollution,whereas Ni is correlated to naturally occurring sources, Cd originates from industrial contaminants, andCr is associated with atmospheric deposition
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