25 Oct 2022
25 Oct 2022
Status: this preprint is open for discussion.

Temporal and spatial variations of atmospheric unintentional PCBs emissions in Chinese mainland from 1960 to 2019

Ye Li1, Ye Huang1, Yunshan Zhang1, Wei Du4, Shanshan Zhang1, Tianhao He1, Yan Li1,3, Yan Chen1, Fangfang Ding1, Lin Huang1, Haibin Xia1, Wenjun Meng2, Min Liu1, and Shu Tao2 Ye Li et al.
  • 1Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, 500 Dongchuan Road, Minhang District, Shanghai 200241, China
  • 2Laboratory of Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing 100871, China
  • 3Collaborative Innovation Center of Sustainable Forestry, College of Forestry, Nanjing Forestry University, 159 Longpan Road, Xuanwu District, Nanjing, 210037, China
  • 4Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science &Technology, Kunming 650500, China

Abstract. Polychlorinated biphenyls (PCBs) are a group of persistent organic pollutants (POPs) that have been proven to be harmful to ecosystem 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. However, researches estimating UP-PCBs emissions in China are limited. In this study, source-specific and year-varying emission factor (EF) dataset was used to develop emission inventory of 12 dioxin-like UP-PCBs congeners covering 66 sources in Chinese mainland with spatial resolution of province for 1960 to 2019 and 0.1°×0.1° for 2019. 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 Chinese mainland. Geographically, East and North China contributed largest UP-PCBs emission across Chinese mainland. High emission densities were mainly happened in the densely populated and well-developed region 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.

Ye Li et al.

Status: open (until 06 Dec 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-977', Anonymous Referee #2, 01 Nov 2022 reply
    • AC1: 'Reply on RC1', Ye Li, 04 Nov 2022 reply
  • RC2: 'Comment on egusphere-2022-977', Anonymous Referee #1, 04 Nov 2022 reply
    • AC2: 'Reply on RC2', Ye Li, 11 Nov 2022 reply

Ye Li et al.


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Short summary
Polychlorinated biphenyls (PCBs) are a group of typical persistent organic pollutants (POPs) listed among the 12 initial POPs that should be prohibited or limited under the Stockholm Convention. They widely present in the environment and pose a threat to human health and ecosystems. Emission estimation for them was essential to understand and evaluate their environment fate and associated health effect. This article developed 12 dioxin-like UP-PCBs from 66 sources from 1960 to 2019 in China.