Pollution characteristics and source analysis of atmospheric VOCs:taking Puyang,one of the"2+26"cities,as an example
According to the monitoring results of atmospheric VOCs in Puyang in 2021,one of the"2+26"cities,the pollution characteristics,ozone generation potential and pollution sources of VOCs were analyzed.The research showed that:the proportion of each component was alkane＞olefin＞aromatic hydrocarbon＞alkyne.The concentration levels of ethane,propane,ethylene,n-hexane,acetylene,isobutane,n-butane,isopentane,toluene,benzene,formaldehyde and acetaldehyde were relatively high.According to the analysis of contribution to ozone generation,alkanes were the components with higher concentrations and less ozone generation activity,while olefins and aromatic hydrocarbons were components with lower concentrations and high ozone generation activity.The key active substances were ethylene,m/p-xylene,toluene,formaldehyde,acetaldehyde and hexanal.The formation of ozone in Puyang was sensitive to the concentration of VOCs.The concentration level of VOCs key substances with wind direction showed certain variation characteristics.There were five main pollution sources of atmospheric VOCs in Puyang,including mobile sources,combustion sources,petrochemical sources,solvent use sources and natural emission sources,among which mobile sources contribute the most.The pollution sources of benzene series in VOCs were mainly related to petrochemical production and fossil fuel combustion.
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