Study on influencing factors and sources apportionment of a typical O3 pollution process during autumn in Nanjing
Based on the data from the Nanjing Automatic Air Monitoring Network,O3 lidar,and wind profiler radar,the influencing factors and sources of a typical O3 pollution process in the autumn of September 22-26,2021 in Nanjing were analyzed by using the hybrid single particle lagrangian integrated trajectory(HYSPLIT)model,ozone formation potential(OFP),and positive matrix factorization(PMF)model.The results showed that:1)during this typical O3 pollution process,meteorological conditions such as high temperature,low humidity,and strong light promoted O3 generation,while wind speed and direction affected O3 horizontal and vertical transport,resulting in spatiotemporal changes in the high O3 concentration area.2)In the early stage of the pollution process,O3 production was controlled by VOCs,while in the middle and later stages of the process,it transitioned from the VOCs control zone to the collaborative control zone.3)The top two contributors to OFP were oxygenated volatile organic compounds(OVOCs)and aromatic hydrocarbons,with the former contributing the most during the peak stage and the latter contributing the most during the accumulation stage.4)The PMF results showed that the main sources of VOCs were motor vehicle emissions(39.4％),combustion(22.8％),chemical emissions and solvent use(18.8％),and oil and gas volatilization(12.9％).
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