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

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.


  • 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.


The use of 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-cig use. In two well-controlled adjacent rooms (one vaping room and one non-vaping room), we simultaneously measured ultrafine particle number concentration (PNC) and fine particle mass concentrations (PM2.5) during e-cig use under six conditions: (1) baseline; (2) closing the connecting door between the two rooms; (3) enhanced ventilation in the vaping room or (4) the non-vaping room; (5) operating an air purifier in the vaping room or (6) in the non-vaping room. We found that the indoor particle concentrations were substantially reduced in both rooms when either the ventilation was enhanced or the air purifier was operated. Blocking the door between the two rooms is the most effective way to reduce the transport of ultrafine particles from the vaping room to the non-vaping room (by 42%). However, it leads to a 26% increase of PNC in the vaping room. Previous study has demonstrated high concentrations of particles in vape shops without any mitigation. Our results could inform future studies to assess and reduce exposures to e-cig aerosols and associated health effects.

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

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