Polycyclic aromatic hydrocarbons (PAHs) in vegetables may pose a cancer risk via consumption of contaminated vegetables. Thus, this study aims to analyze the concentrations of PAHs in home-grown allium fistulosum from an industrial city of China, and assess the exposure risks. The results indicate that adsorption of PAHs through roots and local anthropogenic pollution were major factors affecting accumulation of PAHs in edible parts of allium fistulosum. The sources of PAHs were identified as vehicle emissions, agricultural waste burning and pollution discharges of petroleum factories. Daily dietary exposures of consumers to PAHs in allium fistulosum ranged from 2.76×10^-4 to 7.02×10^-5 ng/(d·kg), children had the highest daily exposure dose, while the teenagers had the lowest. For individuals of different gender and age groups (children, teenagers, adults and old), the incremental lifetime cancer risks (ILCRs) ranged from 1.4×10^-6 to 3.5×10^-5, which were all higher than safe risk level of 10^-6. The findings of this study suggest that growing allium fistulosum in the urban areas of an industrial city may pose low cancer risks to consumers.