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. 2020 Apr 24;17(8):2947. doi: 10.3390/ijerph17082947

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Levels of particulate matter with an aerodynamic diameter smaller than 1 (PM₁) (a), 2.5 (PM_2.5) (b), 4 (PM₄) (c), and 10 µm (PM₁₀) (d) (values expressed as Log₁₀) measured before and during the vaping session of an Iqos1. Red line divided the concentrations measured before and those measured during the vaping session.