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A clear understanding of the factors governing dual isotopes (δ15N-NO3- and δ18O-NO3-) in typhoons is essential for understanding their NO3- sources and its formation mechanisms. In this study, sequential precipitation samples during typhoons, including In-fa and Chanthu, were collected from Ningbo, Hangzhou and Huzhou. The chemical compositions, nitrogen and oxygen isotopes of NO3- and oxygen isotopes of H2O (δ18O-H2O) were measured. The results showed that the δ15N-NO3- and δ18O-NO3- values ranged from -6.3‰ to 6.0‰, and 38.0‰ to 66.5‰,
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