Abstract
By monitoring the changes of SS/COD/TP/TN in rainwater runoff in residential, industrial, commercial and traffic areas of Xi’an with the rainfall duration, the characteristics of rainwater runoff pollution in different areas of the city are explored. The results show that the concentration of pollutants in different regions from high to low is: traffic area>industrial area>residential area>commercial area. The concentration of pollutants in rainwater runoff in various regions reached a peak at the beginning of rainfall (within 30 minutes), and then gradually decreased and stabilized. The concentration of main pollutants in rainwater runoff in traffic areas is significantly higher than that in other areas. It can be seen that transportation may be the main factor affecting urban rainwater runoff pollution
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