Li Zhang1 , Yan Lin2 , Yifang Zhu This email address is being protected from spambots. You need JavaScript enabled to view it.1,2

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Institute of Environment and Sustainability, University of California Los Angeles, Los Angeles, CA 90095, USA
Department of Environmental Health Sciences, Jonathan and Karin Fielding School of Public Health, University of California Los Angeles, Los Angeles, CA 90095, USA

Received: March 3, 2020
Revised: May 10, 2020
Accepted: May 18, 2020

 Copyright The Author's institutions. 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. 

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Cite this article:

Zhang, L., Lin, Y. and Zhu, Y. (2020). Transport and Mitigation of Exhaled Electronic Cigarette Aerosols in a Multizone Indoor Environment. Aerosol Air Qual. Res. 20: 2536–2547.


  • E-cig use leads to elevated particle levels in an indoor environment.
  • Exhaled e-cig particles from a vaping room transports to an adjacent non-vaping room.
  • Increasing ventilation or turning on an air purifier decreases e-cig particle levels.
  • Segregation between the vaping and non-vaping rooms reduces e-cig particle transport.


Using an electronic cigarette (e-cig) has been shown to emit a substantial amount of particles and degrade indoor air quality. Here, we tested the effectiveness of different mitigation strategies to reduce indoor particulate pollution due to e-cigs. We simultaneously measured concentrations of particle number (PNC) and fine particle (PM2.5) mass in a vaping room and an adjacent non-vaping room, both of which were well controlled, during e-cig use under six different experimental conditions: (1) the baseline scenario, in which the connecting door between the two rooms was open, the ventilation in both rooms was low, and no air purifier was operated; (2) the connecting door between the two rooms was closed; (3) the ventilation was enhanced in the vaping room; (4) the ventilation was enhanced in the non-vaping room; (5) an air purifier was operated in the vaping room; and (6) an air purifier was operated in the non-vaping room. We found that the particle concentrations significantly decreased in both of the rooms when either the ventilation was enhanced or the air purifier was operated. Closing the connecting door between the two rooms produced the largest reduction (42%) of PNC in the non-vaping room; however, it also led to a 26% increase of PNC in the vaping room. Previous studies have demonstrated that vape shops contain high concentrations of particles when no mitigation strategies are implemented. Our results provide a basis for assessing and reducing exposure to e-cig aerosols and its associated health effects in future studies.

Keywords: Electronic cigarette; Ultrafine particles; PM2.5; Transport; Mitigation.

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