Abstract：Off-line measurements were conducted to obtain 105 VOCs at 11 sites across Shenzhen during November 6~9 in 2019. The spatial distribution characteristics of ozone generation potential (OFP) and secondary organic aerosol generation potential (SOAFP) were further analyzed. The results showed that total VOCs (TVOCs), total OFPs and total SOAFPs were 44.3×10-9, 272.6 and 1.1μg/m3, respectively. The spatial distributions of TVOCs, OFP and SOAFP had a similar trend with a higher level in the west and north region and a lower level in the east and south region, which indicated that mitigating industrial emissions in the northwestern industrial area is essential for VOCs reduction. Among the different VOC species, acetone, dichloromethane and ethane had higher volume concentrations; 1,3-butadiene, toluene, acetaldehyde had higher OFPs; and toluene and xylene had higher SOAFPs. The ratio of toluene to benzene suggested that industrial sources such as solvent emission made a significant effect on VOCs. Additionally, n-butane, toluene and 2, 3-dimethylbutane had larger regional differences. In conclusion, n-butane, isobutane, toluene, xylenes and 1,3-butadiene, as the most active and local emitting species, were the key VOCs for the coordinated control of O3 and PM2.5 in Shenzhen.
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