Hing Cho Cheung This email address is being protected from spambots. You need JavaScript enabled to view it.1, Chengyu Nie2, Mintao Huang2, Tingting Yang2, Hao Wang4, Celine Siu Lan Lee5, Chenglei Pei6,7,8, Jun Zhao2,3, Baoling Liang2 

1 Research Center for Environmental Changes, Academia Sinica, Taipei 11529, Taiwan
2 School of Atmospheric Sciences and Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou 510275, China
3 Guangdong Provincial Field Observation and Research Station for Climate Environment and Air Quality Change in the Peral River Estuary, Guangdong 510275, China
4 Institute for Environmental and Climate Research, Jinan University, Guangdong 510632, China
5 Department of Civil Engineering, Chu Hai College of Higher Education, Tuen Mun, Hong Kong SAR, China
6 State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangdong Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
7 University of Chinese Academy of Sciences, Beijing 100049, China
8 Guangzhou Ecological and Environmental Monitoring Center of Guangdong Province, Guangzhou 510060, China

Received: February 25, 2022
Revised: May 19, 2022
Accepted: June 7, 2022

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.4209/aaqr.220097  

Cite this article:

Cheung, H.C., Nie, C., Huang, M., Yang, T., Wang, H., Lee, C.S.L., Pei, C., Zhao, J., Liang, B. (2022). Influence of regional Pollution Outflow on Particle Number Concentration and Particle Size in Airshed of Guangzhou, South China. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.220097


  • Notably high ratios of monsoon versus land–sea breeze particle concentration (0.93–1.18).
  • Significant Aitken mode particles (up to 51.2%).
  • High correlation between particle concentrations (r = 0.60–0.70) of the two sites.
  • Higher averaged growth rates (14 nm h–1) among major urban sites in China.
  • Significant new particle formation under high H2SO4 proxy with low wind speed.


A measurement campaign of particle number concentration and size distribution was conducted at urban (SYSU) and suburban (Panyu) areas of Guangzhou, South China, during 16 January to 3 February 2020 before and during the Chinese New Year (CNY) holiday. Average particle number concentration (PNC) was 6.3 × 103 cm-3 and 9.7 × 103 cm-3, respectively, at urban and suburban sites, indicating the severe particulate matter (PM) pollution. The PNC in the region was influenced by monsoon and the land–sea breeze systems. During monsoon seasons, PM pollution occurred at a regional scale affecting the urban and suburban areas as indicated by the high PNC correlation (r value = 0.70), but the PNCs were lower than that during land-sea breeze period (with lower PNCM1/PNCLSB1 and PNCM2/PNCLSB2 ratios) due to the higher atmospheric dispersion. There is a strong local emission (mainly vehicular emissions) in both urban and suburban areas which was significantly lowered during the CNY period due to reduced human activities. The PM pollution was found to be significantly influenced by local emissions (dominated by Aitken mode particles) and new particle formation (NPF) process (dominated by nucleation mode particles). NPF event was found to be associated with a higher N10-25/H2SO4 proxy ratio during the low wind speed condition.

Keywords: Particle number concentration, Size distribution, Megacity, Regional pollution, New particle formation

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