Analysis of Pollution Characteristics of Atmospheric VOCs and Their Ozone Formation Potential in Nanjing
Based on the automatic monitoring data of atmospheric volatile organic compounds(VOCs)in Nanjing from 2016 to 2022,this study analyzed the pollution characteristics of VOCs and their ozone formation potential(OFP).The results showed that the volume fraction of atmospheric VOCs and their components in Nan-jing decreased significantly from 2016 to 2022,the average value of TVOCs in 7 years was 21.7 × 10-9.The pro-portion of each component in order from large to small was alkanes,alkenes,aromatics and alkynes.The con-centrations of TVOCs,alkanes,alkenes and aromatics had the same seasonal variations,with winter＞autumn＞spring＞summer.For alkyens,it was winter＞spring＞autumn＞summer.The overall monthly variation of TVOCs,alkanes,alkenes and alkynes showed a"V"character,and aromatics was approximately a"W"type.Except for alkynes,the diurnal variation of hourly volume fraction was basically"unimodal".The interannual variation of OFP showed a significant downward trend from 2016 to 2022,with a 7-year mean of 132.1 μg/m3.The components that contributed more to OFP were al-kenes(39.1％)and aromatics(38.1％).The key spe-cies of VOCs generating ozone were ethylene,m/p-xylene,toluene,propylene and isoprene.Reducing the emis-sion of alkenes and aromatics was beneficial to ozone prevention and control in Nanjing.
万方数据
维普
