Special issue in honor of Prof. David Y.H. Pui for his “50 Years of Contribution in Aerosol Science and Technology”

Jindarat Pariyothon1,2, Surat Bualert This email address is being protected from spambots. You need JavaScript enabled to view it.2, Parkpoom Choomanee2, Thitima Rungratanaubon2, Thunyapat Thongyen3, Narita Fakkaew4, Chayaporn Phuetfoo2, Jitlada Phupijit2, Wladyslaw W. Szymanski2,5 

1 Department of Social & Applied Science, College of Industrial Technology, King Mongkut' s University of Technology North Bangkok, Bangkok 10800, Thailand
2 Department of Environmental Science, Faculty of Environment, Kasetsart University, Bangkok 10900, Thailand
3 Department of Environmental Technology & Management, Faculty of Environment, Kasetsart University, Bangkok 10900, Thailand
4 Department of Environmental Health, Faculty of Public Health, Kasetsart University, Sakon Nakhon 47000, Thailand
5 Faculty of Physics, University of Vienna, 1090 Vienna, Austria

Received: October 30, 2022
Revised: March 6, 2023
Accepted: March 7, 2023

 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.220374  

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Cite this article:

Pariyothon, J., Bualert, S., Choomanee, P., Rungratanaubon, T., Thongyen, T., Fakkaew, N., Phuetfoo, C., Phupijit, J., Szymanski, W.W. (2023). Hygroscopic Growth Factors of Sub-micrometer Atmospheric Aerosols at Four Selected Sites in Thailand. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.220374


  • Relationship between geographic location and hygroscopic growth factor established.
  • Environmental factors determined the temporal variability of particle size fractions.
  • Sub-partition of nearly-hydrophobic growth factor fraction was introduced.


Hygroscopic growth factor (Gf) of aerosols is related to water loading on particles  in sub-saturated conditions. It is an essential parameter for assessing the role of atmospheric particles in the radiative transfer and cloud formation process. Therefore, the temporal variation in Gf of size-selected atmospheric particles from the Aitken mode (Dp £ 100 nm) and accumulation mode (Dp > 100 nm) was measured using a humidified tandem differential mobility analyser (H-TDMA) and the relationship between particle size and Gf for various locations and meteorological conditions was determined. The origin of ambient particles primarily defines their properties and governs their participation in atmospheric processes. Thus, the measurements were performed in locations with different land-use types: urban, rural, coastal-industrial, and landlocked industrial areas. The data showed site-dependent patterns of temporal and spatial changes in Gf. The results indicated that the number-weighted Gf averaged over the investigated particle size range (30–250 nm) was highest in rural areas (Gf = 1.27), followed by coastal-industrial (Gf = 1.19), urban (Gf = 1.11), and landlocked industrial areas (Gf = 1.06). Particles in the urban and landlocked industrial areas had relatively low Gf values, suggesting that they originated mainly from fossil fuel combustion, in contrast to particles at other sites which can be attributed to coastal proximity.

Keywords: Aerosols, Hygroscopicity, Particle fractions, Precipitable water, Topographical location

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