[Physico-chemical Characteristic Analysis of PM2.5 in the Highway Tunnel in the Plateau City of Kunming].

• DOI: 10.13227/j.hjkx.201702052
• Publication Date: 2017-12-08
• Authors: Chenghui Wang; Kun Yan; Xinyu Han; Ze Shi; Li-Mei Bi; Feng Xiang; Ping Ning; Jianwu Shi
• Keywords: Inorganic ions; Mass concentration (chemistry)

This research aimed to determine the characteristics of motor vehicle exhaust emissions in plateau area. The PM2.5 was evaluated Caohai Tunnel Kunming for this study by measuring water-soluble inorganic ions, carbonaceous species, polycyclic aromatic hydrocarbons (PAHs), and elements air samples. results showed that mass concentration tunnel about 225.65-312.84 μg·m-3, which is 11-14 times ambient atmosphere. species were most abundant constituting 35.73% total PM2 5 mass, followed 21.78% ions range 4.79%-5.52%. smallest proportion PAH, 0.25%-0.32%. Ca2+ SO42- concentrations highest among accounted 77.78%-80.17% from crust source. NH4+ NO3- are relatively high, coming mainly automobile exhausts. 4 6 ring PAHs with higher molecular weight lower volatility dominant components Tunnel. contributing very significant. poisonous single BaP 23-29 than state regulations exposure limit, it has reached a hazardous level. It obvious there health risks highway tunnel. A principal component analysis (PCA) sources road dust emission 61.64%, mechanical wear 17.49% tire 9.11% PM2.5. Under conditions hypobaric hypoxia Yun-Gui plateau, greater chance incomplete combustion fuels, resulting increase OC emissions.