Understanding the characteristics of volatile organic compounds (VOCs) emission from coating industry is important to formulate the prevention and control strategy of ozone (O₃) and PM_2.5 in Shandong province.In this work,the volatile organic compounds (VOCs) discharged from metal coating process are analyzed for Shandong's two food packaging factories.The results showed that the concentration of VOCs emitted by the two factories were similar,with variations ranged at 50-1 500 μg/m³.However,their VOCs compositions were different to some extent.The oxygenated volatile organic compounds (OVOCs) was dominant and accounted for 89.71% of total VOCs discharged by factory manufacturing both aluminum and tinplate cans (Factory 1); while the aromatic hydrocarbon (56.15%) instead of the OVOCs (32.32%) became the main component of total VOCs discharged by factory manufacturing only aluminum cans (Factory 2).The VOCs source profiles were also different between the two factories.Specifically,the ethanol was dominant for both Factory 1's internal (94.28%) and external (84.46%) coating processes,while the 2-butanone (24.33%) and toluene (36.40%) were the most important components for Factory 2's internal and external coating process,respectively.