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. Author manuscript; available in PMC: 2023 Feb 21.
Published in final edited form as: Chem Res Toxicol. 2022 Jan 25;35(2):254–264. doi: 10.1021/acs.chemrestox.1c00309

Figure 4.

Figure 4.

Size distribution of VEA vaping aerosols characterized by (A) volume and (B) number concentrations. Collection efficiency was determined by comparing the (C) total particle volume concentration and (D) total particle number concentration sampled immediately after emission from the vape pen and after tandem cold trap collection. Particle collection efficiency was estimated to be ≥ 99.9% by both volume and by number. One puff was taken for each SEMS sampling cycle (3 min). Results are expressed as the average of 3 cycles (n=3) after background subtraction.