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Discussion papers
https://doi.org/10.5194/acp-2018-1214
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-1214
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 02 Jan 2019

Research article | 02 Jan 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Local and regional contributions to fine particulate matter in the 18 cities of Sichuan Basin, southwestern China

Xue Qiao1,2, Hao Guo2, Ya Tang3, Pengfei Wang2, Wenye Deng4, Xing Zhao5, Jianlin Hu6, Qi Ying7, and Hongliang Zhang2 Xue Qiao et al.
  • 1Institute of New Energy and Low-carbon Technology & Healthy Food Evaluation Research Center, Sichuan University, No. 24, South Section One, First Ring Road, Chengdu, Sichuan 610065, China
  • 2Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge LA 70803, USA
  • 3College of Architecture and Environment & Healthy Food Evaluation Research Center, Sichuan University, Chengdu 610065, China
  • 4Xinjiang Academy of Environmental Protection Science, Urumqi 830011, China
  • 5Department of Epidemiology and Biostatistics, West China School of Public Health, Sichuan University, No. 17, Section 3, South Renmin Road, Chengdu, Sichuan 610041, China
  • 6Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Engineering Technology Research Center of Environmental Cleaning Materials, Nanjing University of Information Science & Technology, Nanjing 210044, China
  • 7Zachry Department of Civil Engineering, Texas A&M University, College Station, TX 77843, USA

Abstract. The Sichuan Basin (SCB) is one of the regions suffering from severe air pollution in China, but fewer studies have been conducted for this region than the more developed regions in North and East China. In this study, a source-oriented version of the Community Multi-scale Air Quality (CMAQ) model was used to quantify contributions from nine regions to PM2.5 (i.e., particulate matter (PM) with an aerodynamic diameter less than 2.5μm) and its components in the 18 cities within the SCB in the winter (December 2014 to February 2015) and summer (June to August, 2015). In the winter, citywide average PM2.5 concentrations are 45~126μgm−3, with 21~51% and 39~66% due to local and non-local emissions, respectively. In the summer, 15~45% and 25~52% of citywide average PM2.5 (14~31μgm−3) are due to local and non-local emissions, respectively. Compared to primary PM (PPM), the inter-region transport of secondary inorganic aerosols (SIA, including ammonia (NH4+), nitrate (NO3), and sulfate (SO42−)) is greater. The region to the east of SCB (R7) is the largest contributor outside the SCB, and it can contribute approximately 80% in the northeast, east, and southeast rims of the SCB, but only 10% in the other regions in both seasons. Under favorable transport conditions, regional transport of air pollutants from R7 could account for up to 35~100μgm−3 of PM2.5 in each of the SCB cities in the winter. This study demonstrates that it is important to have joint emission control efforts among cities within the SCB and neighbor regions to the east in order to reduce PM2.5 concentrations and prevent high PM2.5 days for the entire basin.

Xue Qiao et al.
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Short summary
A source-oriented version of the CMAQ model was used to quantify contributions from nine regions to PM2.5 and its components in the 18 cities within the Sichuan Basin. Non-local emissions contribute to 39~66 % and 25~52 % to the citywide average PM2.5 concentrations of 45~126 and 14~31 μg m−3 in the winter and summer, respectively. This study demonstrates the importance of joint emission control efforts among cities within the SCB and neighbor regions to the east.
A source-oriented version of the CMAQ model was used to quantify contributions from nine regions...
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