多环芳烃（PAHs）和黑碳（BC）常在PM2.5中共存，因为它们都是有机物不完全燃烧时形成的。这些化合物被认为是有潜在健康影响的危险空气污染物，包括呼吸系统和心血管系统效应。本研究旨在评估台湾北部城市区域PAHs和BC的健康风险，通过分析和定量化PM2.5中由美国环境保护局确定的16种重要PAHs和BC的浓度，它们之间的关系以及可能的来源。结果表明，总PAHs和BC的平均浓度分别为0.91 ng m-3和0.97 μg m-3，二者之间存在显著正相关关系，表明具有相同的排放源。结果还表明，化石燃料燃烧和交通排放是PAHs的主要贡献因素，而木材和生物质燃烧则发挥较次要的作用。在这16种重要PAHs中，苯并[a]芘、二苯并[a,h]蒽、苯并[b]芴和吲哚[1,2,3-cd]芘是主要的致癌化合物，占总致癌毒性的89.0%。因此，由PAHs暴露导致的终身额外癌症风险估计为8.03×10-6，表明在采样地点存在潜在的致癌风险。总体而言，本研究强调未来应制定减少台湾北部地区BC和共生PAHs局部排放的交通排放和化石燃料燃烧的减缓政策的必要性。版权所有 © 2023 Elsevier Ltd.

Polycyclic aromatic hydrocarbons (PAHs) and black carbon (BC) often coexist in PM2.5 because both form during the incomplete combustion of organic matter. These compounds are regarded as hazardous air pollutants with potential health effects, including respiratory and cardiovascular effects. In this study, to evaluate the health risks of PAHs and BC at an urban site in northern Taiwan, 16 priority PAHs and BC, identified by the United States Environmental Protection Agency, were analyzed and quantified in PM2.5 to determine their concentrations, their relationship with each other, and their likely sources. The results indicated that the mean concentrations of total PAHs and BC were 0.91 ng m-3 and 0.97 μg m-3, respectively, with a significant positive correlation between them, indicating the same emission sources. The results also indicated that fossil fuel combustion and traffic emissions were primary contributors to PAHs, with wood and biomass combustion playing a less prominent role. Among these 16 priority PAHs, benzo[a]pyrene, dibenz[a,h]anthracene, benzo[b]fluoranthene, and indeno[1,2,3-cd]pyrene served as major carcinogenic compounds, accounting for 89.0% of the total carcinogenic toxicity. Thus, the lifetime excess cancer risk resulting from PAH exposure was estimated as 8.03 × 10-6, indicating a potential carcinogenic risk to human health at the sampling site. Overall, this study highlights the need for future mitigation policies for traffic emissions and fossil fuel combustion for reducing the local emissions of BC and co-produced PAHs in northern Taiwan.Copyright © 2023. Published by Elsevier Ltd.