Year: 2017
Type: article
Abstract: The electronic cigarette (EC) is a new source of indoor airborne particles. To better understand the impacts of secondhand vaping (SHV) emissions on indoor air quality, real-time measurements of particle size distribution, particle number concentration (PNC), fine particulate matter (PM2.5), CO2, CO, and formaldehyde were conducted before, during, and after 10 min EC-use among 13 experienced users in an 80 m3 room. To assess particle transport in the room, multiple sampling locations were set up at 0.8, 1.5, 2.0, and 2.5 m away from the subjects. The arithmetic mean (standard deviation) of background PNC and PM2.5 concentrations in the room were 6.39 × 103 (1.58 × 102) particles/cm3 and 8 (1) μg/m3, respectively. At 0.8 m away from EC users, right after initiation of puffing, the PNC and PM2.5 concentrations can reach a peak of ∼105 particles/cm3 and ∼3 × 103 µg/m3, respectively, and then dropped quickly to background levels within 20 s due to dilution and evaporation. At the 0.8 m sampling location, the mean PNC and PM2.5 concentrations during puffing were 2.48 × 104 (2.14 × 104) particles/cm3 and 188 (433) µg/m3, respectively. In addition, two modes of SHV particles were observed at about 15 and 85 nm. Moreover, concentrations of SHV particles were negatively correlated with the distances to EC users. At the 1.5 m location, PNC and PM2.5 levels were 9.91 × 103 (1.76 × 103) particles/cm3 and 19 (14) µg/m3, respectively. Large variations of mean PNC levels exhaled per puff were observed both within and between EC users. Data presented in this study can be used for SHV particle exposure assessment.Copyright © 2017 American Association for Aerosol Research
Source: Aerosol Science and Technology
Language: English
Subfield: Physiology
Field: Medicine
Domain: Health Sciences
Open Access status: bronze
OpenAlex ID: W2734964632