Abstract: Taking a typical ozone pollution episode that occurred in Xinxiang City from June 4th to 12th,2022 as an example,this study investigated the pollution process,meteorological conditions,pollution characteristics of atmospheric volatile organic compounds (VOCs),and their source apportionment.The results indicated that the changes of ozone concentration were influenced by both local photochemical generation and regional transport during the study period.The daily average mass concentration of total volatile organic compounds (TVOCs) was 53.31 μg/m³,with oxygenated volatile organic compounds (OVOCs,42.7%) and alkanes (29.4%) being the dominant components.OVOCs contributed the most to the ozone formation potential (OFP),accounting for 54.65%,followed by alkenes and alkynes (24.18%).Source analysis using characteristic component ratios of benzene/toluene and isopentane/n-pentane indicated that VOCs components mainly originated from fossil fuel combustion and vehicle exhaust emissions,while pentane VOCs were mainly affected by coal combustion emissions.The air masses during this pollution episode exhibited a high degree of aging,with a significant contribution from regional imported pollution.The source apportionment using the PMF model showed that VOCs mainly came from solvent usage,fossil fuel combustion,vehicle exhaust,natural sources and industrial emissions during this pollution episode.