OPEN ACCESS

Articles online

Understanding the Regional Transport Contributions of Primary and Secondary PM2.5 Components over Beijing during a Severe Pollution Episodes

Category: Air Pollution Modeling

Article In Press
DOI: 10.4209/aaqr.2017.10.0406
PDF | RIS | BibTeX

Wei Wen1,2, Xiaodong He 1, Xin Ma 3, Peng Wei4, Shuiyuan Cheng5, Xiaoqi Wang5, Lei Liu2

  • 1 Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, China
  • 2 Key Laboratory of Atmospheric Chemistry, China Meteorological Administration, Beijing 100081, China
  • 3 National Meteorological Center, Beijing 100081, China
  • 4 Chinese Research Academy of Environment Science, Beijing 100012, China
  • 5 Key Laboratory of Beijing on Regional Air Pollution Control, Beijing University of Technology, Beijing 100124, China

Highlights

The model was applied to study the regional transport of PM2.5 components.
The secondary components are more easily affected by transport than the primary.
The strategies require coordinated effort to reduce long-range transport and local generation.


Abstract

This study applied the CAMx model to study the regional transport of various PM2.5 components in Beijing during a severe pollution episodes. The results revealed that during the episodes, Beijing had the average PM2.5 pollution value of 119 µg m–3. It was 1.58 times of the PM2.5 national air quality standard (75 µg m–3 Level II). The wind speed was low (< 2 m s–1) and relative humidity reached 98%. The anticyclone in Eastern China showed weak local flow fields and southerly winds at the surface and strong temperature inversion under 1000 m, which promote pollution accumulation. The contribution of monthly regional transport to primary PM2.5 components and SO42–, NO3, and secondary organic aerosol concentrations in Beijing were 29.6%, 41.5%, 58.7%, and 60.6%, respectively. The emissions from Baoding had the greatest effect on the primary components of PM2.5 (6.1%) in Beijing. The emissions from Tianjin had the greatest influence on the secondary components of PM2.5 concentrations. These values indicated that the secondary components of Beijing’s PM2.5 are more easily affected by transboundary transport than are the primary components. The present findings suggest that control strategies for PM2.5 pollution should include coordinated efforts aimed at reducing secondary aerosol precursors (SO2, NOx, and VOCs) from long-range transport and local generation in addition to primary particulate emissions.

Keywords

PM2.5 pollution Regional transport Secondary component Air quality modeling


Related Article

Spatial and Temporal Characteristics and Main Contributing Regions of High PM2.5 Pollution in Hong Kong

Hui Ding, Yonghong Liu, Zhi Yu , Ching Cheung, Juanming Zhan
Volume: 17 | Issue: 12 | Pages: 2955-2965
DOI: 10.4209/aaqr.2016.09.0412
PDF

Characteristics of PM2.5 and Assessing Effects of Emission–Reduction Measures in the Heavy Polluted City of Shijiazhuang, before, during, and after the Ceremonial Parade 2015

Gang Wang, Shuiyuan Cheng , Jianlei Lang , Xiaowen Yang, Xiaoqi Wang, Guolei Chen, Xiaoyu Liu, Hanyu Zhang
Volume: 17 | Issue: 2 | Pages: 499-512
DOI: 10.4209/aaqr.2016.05.0181
PDF

Improvement of the Real-time PM2.5 Forecast over the Beijing-Tianjin-Hebei Region using an Optimal Interpolation Data Assimilation Method

Haitao Zheng, Jianguo Liu , Xiao Tang, Zifa Wang , Huangjian Wu, Pingzhong Yan, Wei Wang
Accepted Manuscripts
DOI: 10.4209/aaqr.2017.11.0522
PDF

Determining VOCs Reactivity for Ozone Forming Potential in the Megacity of São Paulo

Débora Souza Alvim , Luciana Vanni Gatti, Sergio Machado Corrêa, Júlio Barboza Chiquetto, Guaciara Macedo Santos, Carlos de Souza Rossatti, Angélica Pretto, José Roberto Rozante, Silvio Nilo Figueroa, Jayant Pendharkar, Paulo Nobre
Accepted Manuscripts
DOI: 10.4209/aaqr.2017.10.0361
PDF
;