This study reports temporal and spatial variations of 16 different species of particulate polycyclic aromatic hydrocarbons (particle-bonded PAHs) in the indoor and outdoor environments of three sampling sites in Bandar Mahshahr city, Iran. A low-volume air sampler was employed to collect size-segregated particulate matter during winter (October to December 2015), and summer (July to September 2016). The results showed that the annual concentrations of indoor and outdoor PM₁₀ and PM_2.5 were much higher than the related World Health Organization guidelines. The concentration of total particle-bonded PAHs (TPAHs) was higher in winter than in summer and a significant difference between the two sampling seasons was observed. The indoor and outdoor carcinogenic PAHs to TPAHs concentrations ratios in the sampling sites in summer and winter were as follow: for PM₁₀ 40.15–42.51%, PM_2.5 41.30–42.97%, and PM₁ 43.07–44.36%, respectively; furthermore, the smaller the particle size, the higher the percentage of carcinogenic PAHs. 2 ring PAHs had a very small contribution to the total PAHs (about 1%), whereas PAHs with 3-to-4 rings had much larger contributions, ranging from 71.65% to 75.17%. The results demonstrated that as PM size decreased, the proportion of 5-to-6-ring PAHs to the total PAHs increased. Since 5-to-6- ring PAHs are considered to be more toxic, hence more attention should be paid to fine particles. The diagnostic ratios of indoor and outdoor of three sampling sites in both seasons suggested that petrogenic sources, as well as combustion of petroleum and other fossil fuels were the main PAHs sources.

本研究报告了伊朗班达尔马赫沙赫尔市三个采样点室内和室外环境中 16 种不同颗粒多环芳烃（颗粒键合 PAH）的时间和空间变化。采用低容量空气采样器在冬季（2015 年 10 月至 12 月）和夏季（2016 年 7 月至 9 月）收集按尺寸分离的颗粒物。结果显示，室内外PM ₁₀和PM _2.5年浓度远高于世界卫生组织相关指南。颗粒结合多环芳烃（TPAHs）总量冬季高于夏季，两个采样季节之间存在显着差异。夏季和冬季采样点室内外致癌PAHs与TPAHs浓度比值分别为：PM ₁₀ 40.15~42.51%、PM _2.5 41.30~42.97%、PM ₁ 43.07~44.36%；此外，粒径越小，致癌PAHs的比例就越高。 2环PAHs对PAHs总量的贡献很小（约1%），而3至4环PAHs的贡献则大得多，范围为71.65%至75.17%。结果表明，随着PM尺寸的减小，5至6环PAHs占PAHs总量的比例增加。由于 5 至 6 环 PAH 被认为毒性较大，因此应更加关注细颗粒。两个季节三个采样点的室内和室外诊断比表明，石油源以及石油和其他化石燃料的燃烧是PAHs的主要来源。