This paper investigates the pollution characteristics of three Chlorobenzene compounds(CBs)-Chlorobenzene(CB)and P-dichlorobenzene(PCB)and 1,2,4-trichlorobenzene(TCB)in PM2.5 of Guiyang,probes the influence of meteorological parameters on CBs concentration and its correlation,explores the influence of wind direction on CBs concentration distribution,clarifies the possible source directions of polluted air masses.The results showed that the average monthly mass concentrations of CB,PCB,and TCB in PM2.5 ranged from 3.26 to 16.9 ng/m3,0.214 to 0.358 ng/m3,and 0.015 9 to 0.032 6 ng/m3.The distribution characteristics of CBs in the particulate matter in ambient air was investigated to provide data support for monitoring the pollution of CBs in PM2.5;The seasonal concentrations all showed the characteristics of high in winter and low in summer.All three CBs concentrations were negatively correlated with temperature and rainfall,but positively correlated with air pressure.The sources of CBs were mainly concentrated between the northeast and southeast directions.
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