Teemu Kärkelä This email address is being protected from spambots. You need JavaScript enabled to view it.1, Jean-Christophe Ebinger2, Unto Tapper1, Olivier Robyr2, Tauno Jalanti2 

1 VTT Technical Research Centre of Finland Ltd., Nuclear Energy, Kivimiehentie 3, 02044 VTT, Espoo, Finland
2 Microscan Service SA, Rue de la Blancherie 17, CP, 1022 Chavannes-près-Renens, Switzerland

Received: December 23, 2020
Revised: May 14, 2021
Accepted: May 31, 2021

 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.200667  

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Cite this article:

Kärkelä, T., Ebinger, J.C., Tapper, U., Robyr, O., Jalanti, T. (2021). Investigation into the Presence or Absence of Solid Particles Generated from Thermal Processes in the Aerosol from an Electrically Heated Tobacco Product with and without Filter Elements. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.200667


  • Electrically Heated Tobacco Product (EHTP) is heated instead of being burnt.
  • Absence of solid particle emissions from the EHTP was studied.
  • Modified EHTPs without the filter elements were produced.
  • The aerosol generated was analyzed using two different approaches.
  • No solid particulate matter was formed from the heating process of the EHTP.


Heated Tobacco Products (HTP) were developed as better alternatives to cigarettes to avoid the release of thousands of chemicals formed when the tobacco is being burnt. One such HTP is the Electrically Heated Tobacco System (EHTS) (from Philip Morris International), in which the tobacco material in the Electrically Heated Tobacco Product (EHTP) is heated instead of being burnt. The significant reduction in emissions from EHTPs compared to combusted cigarettes have been extensively substantiated by independent research groups. The absence of solid particle emissions from the EHTP has also been confirmed in published research. As EHTPs have filter elements between the tobacco portion and the mouth-end, their role associated to the conclusion that no solid particles are formed during use has never been investigated to our knowledge. In this work, aerosol collected from the EHTP with and without filter elements during heating as well as without heating was studied to investigate whether solid particles were formed in any part of the product during use. Two different analytical methods were used and the results from both methods showed that no solid particles originating from thermal processes was present in the EHTP aerosol.

Keywords: Heated Tobacco Product, Aerosol, Heating, Combustion, Solid particles

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