Temporal and spatial variations in atmospheric unintentional PCB emissionsin Chinese mainland from 1960 to 2019

作者：Li, Ye; Huang, Ye^*; Zhang, Yunshan; Du, Wei; Zhang, Shanshan; He, Tianhao; Li, Yan; Chen, Yan; Ding, Fangfang; Huang, Lin; Xia, Haibin; Meng, Wenjun; Liu, Min; Tao, Shu

来源：Atmospheric Chemistry and Physics, 2023, 23(2): 1091-1101.

DOI：10.5194/acp-23-1091-2023

• POLYCHLORINATED-BIPHENYLS
• BLACK CARBON
• COVER CHANGE
• INVENTORY
• URBAN
• COMBUSTION
• CONGENERS
• SOILS
• AIR
• TRANSPORT

Polychlorinated biphenyls (PCBs) are nowadays mainly unintentionally produced, since their use and manufacture has been banned. PCBs, especially those dioxin-like compounds, have been proven harmful to ecosystems and human health. Detailed information about the spatiotemporally distribution of unintentionally produced PCBs (UP-PCBs) is crucial for understanding the environmental fate and associated health risks. How-ever, research estimating UP-PCBs emission in China is limited. In this study, a source-specific and year-varying emission factor (EF) dataset was used to compile provincial emissions of 12 dioxin-like UP-PCBs congeners for 66 sources in the Chinese mainland from 1960 to 2019. In addition to that, emissions for 2019 were allocated into 0.1 degrees x 0.1 degrees grids. The results indicated that historical national UP-PCBs emission represented an increasing trend until around 1995 and then showed an overall decreasing trend from 1995 to 2019. Cement production was the largest UP-PCBs emission source in the Chinese mainland. Geographically, East and North China con-tributed the largest UP-PCBs emission across the Chinese mainland. High emission densities occurred mainly in the densely populated and well-developed regions such as Yangtze River Delta Urban Agglomeration and Pearl River Delta. Furthermore, highly positive correlations of emission densities with population and GDP densities were identified.

• 单位
  北京大学; 南京林业大学; y