Characteristics of atmospheric volatile organic compounds and their relationship with ozone concentration in Lanzhou based superstation observation
In recent years,with the economic and social development of Lanzhou City,ozone(O3)and volatile organic compounds(VOCs)pollution has become increasingly serious and restrict the control of air pollution in Lanzhou.In order to control the pollution of O3 and VOCs in Lanzhou reasonably and effectively,an all-dimensional control system was built in Lanzhou Atmospheric Component Super Monitoring Station to characterize of O3 and its precursors(VOCs)in 2021 in Lanzhou.Positive matrix factorization(PMF)model and ozone formation potential(OFP)were used to analyze the sources of VOCs and the contribution of VOCs to ozone formation respectively.In Lanzhou,O3 level was the highest in summer,slightly lower in spring and autumn,and the lowest in winter.The high incidence of photochemical pollution in summer was the main reason for the high O3 level.VOCs concentration was relative higher in autumn and winter,and the possible causes were the decrease of photochemical reaction,the increase of accumulation effect and coal-burning emission made high VOCs level.The components of VOCs were relatively stable,dominating by OVOCs(35.7％)and alkanes(30.8％).PMF model results showed that motor vehicle emission source(27.1％),fossil fuel combustion source(23.8％),chemical process source(17.9％),gasoline volatilization source(16.0％)and solvent use source(10.7％)were the main contributors to VOCs in this area.By comparing the OFP of VOCs,ethylene,propylene,and toluene played an important role in the ozone formation potential,which should be paid more attention during ozone pollution control.
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