Urbanization, the ecological risks of polycyclic aromatic hydrocarbons (PAHs) to terrestrial ecosystems, and the complex relationship between them have drawn globally attention. In this paper, a comprehensive indicator system was calculated to illustrate the levels of urbanization in 20 coastal cities around the Bohai and Yellow Sea. The top three cities with high levels of urbanization were Tianjin > Qingdao > Dalian. The ecological risk of phenanthrene (Phe) was 52.0%; while the risk of fluoranthene (Flt) was 25.8%, and that of pyrene (Pyr), benzo[a]anthracene (Bap), fluorene (Flu), and naphthalene (Nap) were below 20% throughout the entire region. Risks were high in Dandong, Tianjin, Tangshan, Nantong, and Lianyungang and low in Weihai, Dongying, and Rizhao. The degree of coupling between urbanization and ecological risk of PAHs was above high (0.6) and more than 50% of the coordination degrees were slight unbalance [0.3, 0.5). Furthermore, redundancy analysis showed that the indicator aspects of industry, transportation, and population made great contribution to PAHs risk. Industry correlated to Low Molecular Weight (LMW) PAHs, while transportation correlated to High Molecular Weight (HMW) PAHs. To minimize risk, urbanization scale should be under acceptable level, or the structure of industry and transportation should be optimized.

城市化，多环芳烃对陆地生态系统的生态风险以及它们之间的复杂关系已引起全球关注。本文计算了一个综合指标体系，以说明渤海和黄海附近20个沿海城市的城市化水平。城市化水平最高的前三个城市是天津>青岛>大连。菲（Phe）的生态风险为52.0％；整个区域的荧蒽风险（Flt）为25.8％，of（Pyr），苯并[a]蒽（Bap），芴（Flu）和萘（Nap）的风险均低于20％。丹东，天津，唐山，南通和连云港的风险较高，威海，东营和日照的风险较低。多环芳烃的城市化与生态风险之间的耦合程度高于高（0.6）和超过50％的协调度是轻微的不平衡[0.3，0.5）。此外，冗余分析表明，工业，交通运输和人口指标方面对PAHs风险做出了巨大贡献。工业与低分子量（PAW）PAH相关，而运输与高分子量（HMW）PAH相关。为了使风险最小化，城市化规模应控制在可接受的水平，或者应优化工业和交通运输的结构。