长三角某石化园区VOCs季节特征及臭氧生成潜势分析OA

Based on online monitoring data from 2022 to 2023,the compositional characteristics and seasonal variations of volatile organic compounds(VOCs)in a petrochemical industrial park in the Yangtze River Delta were investigated.The seasonal behaviors of ozone(O3)and its precursors were also discussed.The results show that alkenes and alkanes are the dominant components of VOCs,jointly accounting for over 50%of total VOCs(TVOCs),with the variation in TVOCs largely consistent with that of alkenes.The lowest TVOC concentration occurs in summer(102.2 μg/m3),mainly related to periodic industrial maintenance,the influence of warm and humid marine air masses,and enhanced atmospheric reactivity of alkenes.O3 concentration is higher in spring and autumn due to favorable photochemical conditions.Ozone formation potential(OFP)analysis identifies alkenes as the key contributors to O3 formation.According to the integrated analysis using the full-process atmospheric risk identification framework and positive matrix factorization(PMF)modeling,industrial sources and stationary combustion sources are the primary contributors and the two are significantly related.AERMOD simulations further show that alkenes have the highest contribution to VOCs,underscoring the importance of controlling highly reactive alkene emissions for regional O3 pollution mitigation.