Pollution Characteristics and Photochemical Analysis of VOCs in Changzhi City
The volatile organic compounds(V0Cs)in the air of the main urban area of Changzhi City in 2021 were sampled and analyzed to obtain the variety,content and concentration of the detected substances,analyze the sources of different VOCs,and calculate the ozone generation potential(OFP)of different VOCs species.The results showed that 115 substances were detected at the VOCs automatic monitoring stations in the main urban area of Changzhi City.The annual average value span of V0Cs pollution was 21.236～40.026 ppb,the daily average value span of non methane total hydrocarbons was 313.1～490.8 ppb,and the average estimated value of OFP was 162.239 ug/m3.The factors contributing most to OFP were ethylene,acetaldehyde,followed by M/p-xylene,propionaldehyde,toluene,propylene,isoprene,o-xylene,n-butane 1,1-dichloroethane.The average estimated value of SOAp is 1.726 mg/m3,and isoprene contributes the most to SOAp,followed by toluene,M/p-xylene,benzene,etc.
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