Dae Hoon Park1, Jungho Hwang2, Dongho Shin1, Younghun Kim1,2, Gunhee Lee1, Inyong Park1, Sang Bok Kim1, Keejung Hong  1, Bangwoo Han This email address is being protected from spambots. You need JavaScript enabled to view it.

1 Department of Sustainable Environment Research, Korea Institute of Machinery and Materials, Daejeon 34103, Korea
2 Department of Mechanical Engineering, Yonsei University, Seoul 03722, Korea

Received: April 17, 2023
Revised: April 17, 2023
Accepted: May 16, 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.230088  

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Cite this article:

Park, D.H., Hwang, J., Shin, D., Kim, Y., Lee, G., Park, I., Kim, S.B., Hong, K., Han, B. (2023). Developing an Optimal Antiviral Method for the Air-filtration System of Subway Stations. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.230088


  • Optimal antiviral method for subway station air-filtration systems was developed.
  • Effect of dust contamination and antiviral coating on filter was investigated.
  • Regeneration method of antiviral effect of contaminated filters was proposed.


A novel antiviral method was developed in this study for the air-filtration system of subway stations. Using a dry aerosol coating process, along with a spark discharger and carbon-brush-type ionizer, we developed a high-performance antiviral air filter. Herein, Ag nanoparticles were produced using a spark–discharge generation system with an ion-injection system and were employed as antiviral agents for coating onto a medium-grade air filter. Moreover, we tested the pressure drop in the filter as well as its filtration efficiency and antiviral ability against aerosolized bacteriophage MS2 virus particles as a surrogate of the severe acute respiratory syndrome coronavirus 2 during dust loading. Notably, the dust contamination caused an increase in the filtration efficiency and pressure drop, whereas the antiviral agents (herein, the Ag nanoparticles) did not have a significant effect in this regard. Based on this, we suggested a novel method to regenerate the antiviral effect of the antiviral air filter contaminated by the dust particles. Furthermore, a theoretical analysis of the antiviral ability and antiviral effect regeneration for the case of dust loading was performed using a mathematical model to evaluate the time-dependent antiviral effect of the filter. Our model can be applied to the antiviral air-filtration system of subway stations to prevent the pandemic spread and predict the life cycle of antiviral filters.

Keywords: Antiviral air filter, Bioaerosols, Air-filtration system, Indoor air quality, Subway station

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