Increasing contamination of urban soil by persistent organic pollutants is a major environmental issue. The purpose of the present study was to investigate the distribution, source and human health risk of polycyclic aromatic hydrocarbons (PAHs) in different functional areas in Zhengzhou City, China. Total 130 soil samples were collected from surface layer (0–10 cm) in urban road, overpass, residential area and park in the city during January 2019. Concentrations of ∑PAH₁₆ in the urban soil ranged from 49.90 to 11,565 µg kg⁻¹ and seven carcinogenic PAHs accounted for 69% of the total PAHs. The mean concentrations of PAHs decreased in the following order: urban road > overpass > residential area > park. Analysis based on diagnostic rate demonstrated that PAHs mainly originated from pyrolysis sources including traffic emissions and combustion of coal and biomass. Health risk assessment indicated that PAHs in urban road in the city have potential carcinogenic risks to residents. The present study suggested that the control of urban PAHs pollution in Zhengzhou City should be strengthened.

持久性有机污染物对城市土壤的污染日益增加是一个主要的环境问题。本研究的目的是调查郑州市不同功能区中多环芳烃的分布，来源和对人类健康的危害。2019年1月期间，从城市道路，立交桥，居民区和公园的表层（0–10厘米）收集了130个土壤样品。城市土壤中∑PAH _16的浓度范围为49.90至11,565 µg kg ^-17种致癌多环芳烃占多环芳烃总量的69％。PAHs的平均浓度按以下顺序降低：城市道路>立交桥>居住区>公园。基于诊断率的分析表明，多环芳烃主要来源于热解来源，包括交通排放以及煤炭和生物质的燃烧。健康风险评估表明，城市道路中的PAHs对居民具有潜在的致癌风险。本研究建议应加强郑州市城市多环芳烃污染的控制。