Abstract
The advantages and disadvantages of shade trees for pollutants absorption are analyzed theoretically, through actual inspect and data analysis of typical roads in Xi’an City with CO as environmental tracer. The main factor of green belt hindering the gaseous pollutants diffusion was the canopy density and not the vegetation quantities, thus over increase in green quantity is of nobenefit in urban road planting, and some ideas for green planting in urban street is recommended.
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