Performance of wearable ionization air cleaners: Ozone emission and particle removal

Shi, Shanshan; Zhu, Shihao; Lee, Eon S.; Zhao, Bin; Zhu, Yifang

doi:10.1080/02786826.2016.1139045

Cited by 20 publications

(4 citation statements)

References 38 publications

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“…The interior of the chamber was made of stainless steel to achieve a minimal loss of the emitted aerosols due to surface adsorption. This chamber has been well characterized through our previous studies (Fung, Shu, and Zhu 2014;Liu et al 2014;Shi et al 2016). The test chamber was supplied with aerosols generated by the e-cig device.…”

Section: Methodsmentioning

confidence: 99%

Effects of propylene glycol, vegetable glycerin, and nicotine on emissions and dynamics of electronic cigarette aerosols

Lee

Nguyen

et al. 2020

Aerosol Science and Technology

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An electronic cigarette (e-cig) generates aerosols by vaporizing the e-liquid, which mainly consists of propylene glycol (PG), vegetable glycerin (VG), and nicotine. Understanding the effects of e-liquid main compositions on e-cig aerosols is important for exposure assessment. This study investigated how the PG/VG ratio and nicotine content affect e-cig aerosol emissions and dynamics. A tank-based e-cig device with 10 different flavorless e-liquid mixtures (e.g., PG/VG ratios of 0/100, 10/90, 30/70, 50/50, and 100/0 with 0.0% or 2.4% nicotine) was used to puff aerosols into a 0.46 m 3 stainless steel chamber for 0.5 h. Real-time measurements of particle number concentration (PNC), fine particulate matter (PM 2.5 ), and particle size distributions were conducted continuously throughout the puffing and the following 2-h decay period. During the decay period, particle loss rates were determined by a first-order log-linear regression and used to calculate the emission factor. The addition of nicotine in the e-liquid significantly decreased the particle number emission factor by 33%. The PM 2.5 emission factor significantly decreased with greater PG content in the e-liquid. For nicotine-free e-liquids, increasing the PG/VG ratio resulted in increased particle loss rates measured by PNC and PM 2.5 . This pattern was not observed with nicotine in the e-liquids. The particle loss rates, however, were significantly different with and without nicotine especially when the PG/VG ratios were greater than 30/70. Compared with nonvolatile diethyl-hexyl subacute (DEHS) aerosols, e-cig particle concentration decayed faster inside the chamber, presumably due to evaporation. These results have potential implications for assessing human exposure to e-cig aerosols.

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Section: Methodsmentioning

confidence: 99%

Effects of propylene glycol, vegetable glycerin, and nicotine on emissions and dynamics of electronic cigarette aerosols

Lee

Nguyen

et al. 2020

Aerosol Science and Technology

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“…Indoor ozone sources mainly include laser printers, photocopiers and ionization/ozonolysis air cleaners [ 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 ]. Particularly, ionization/ozonolysis air cleaners may be the principal indoor ozone source owing to the higher ozone emission rate [ 32 ].…”

Section: Resultsmentioning

confidence: 99%

Ventilation and Air Quality in Student Dormitories in China: A Case Study during Summer in Nanjing

Yang

Shen

Gao

2018

IJERPH

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The Air quality in student dormitories can have a major impact on the health of millions of students in China. This study aims to investigate the ventilation and air quality in student dormitories. Questionnaire survey was conducted in eight dormitory buildings and field measurements were conducted in one dormitory during the summer in Nanjing. The survey result reveals that most students thought the indoor and outdoor air quality was neutral and the correlation between indoor and outdoor perceived air quality is statistically significant. There are few indoor PM2.5 and ozone sources in dormitories and natural ventilation is the most common form of ventilation. However, there is no statistically significant correlation between window opening behaviors and the perceptions of indoor and outdoor air quality. The field measurement result shows the measured I/O ratios of PM2.5 and ozone over 37 days are in the range of 0.42–0.79 and 0.21–1.00, respectively. The I/O ratios for PM2.5 and ozone are 0.49 ± 0.05 and 0.26 ± 0.05 in the case of the window being closed, and the I/O ratios for PM2.5 and ozone are 0.65 ± 0.08 and 0.50 ± 0.15 in the case of the window being open. The outdoor and indoor ozone concentrations show pronounced diurnal periodic variations, while the PM2.5 concentrations do not. Finally, recommended open/close window strategies are discussed to reduce indoor pollutant levels. Understanding the indoor/outdoor PM2.5 and ozone concentrations in different window patterns can be a guidance to preventing high indoor PM2.5 and ozone exposure in student dormitories.

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“…Another category investigated in this study was wearable PM2.5 purifiers, which are designed to purify personal micro environmental air so as to mitigate personal exposure to fine and ultrafine particles. Most wearable PM2.5 purifiers are small in size and can be worn on the neck, collar, or bag to remove fine and ultrafine particles from the breathing zone [1].…”

Section: Classification Of Wearable Technology and Devicesmentioning

confidence: 99%

“…Particulate matter (PM) is a major air pollutant in both indoor and outdoor environments [1]. PM10 is defined as a substance less than 10 µm in diameter, called fine dust.…”

Section: Introductionmentioning

confidence: 99%

Public Needs for Wearable Particulate Matter Devices and Their Influencing Factors

Wang

Kang

et al. 2021

Electronics

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Recently, increasing numbers of people have realized the harm that particulate matter (PM) causes to health, especially those with a diameter less than 2.5 μm (PM2.5). With the increasing popularity of wearable devices in recent years, it is believed that wearable technology can contribute feasible solutions to prevent health hazards caused by PM2.5. In order to better understand the public’s needs regarding wearable devices, this study aimed to determine what kinds of PM2.5 wearable devices were needed by the public and the factors that may influence these needs. An online survey was conducted in the Beijing metropolitan area of China of a total of 894 subjects. The results showed that the public’s overall need for wearable PM2.5 purifiers was higher than for wearable PM2.5 trackers. The public’s needs for wearable breathing-zone PM2.5 devices were significantly higher than for any other type, indicating that people care about the quality of the air they actually breathe. It was also found that education, income level, and attitude toward PM2.5 positively affected their needs for wearable devices. In contrast, age had a negative influence on their needs. The results of this study are expected to serve as a valuable reference for related academic and industrial research.

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Performance of wearable ionization air cleaners: Ozone emission and particle removal

Cited by 20 publications

References 38 publications

Effects of propylene glycol, vegetable glycerin, and nicotine on emissions and dynamics of electronic cigarette aerosols

Effects of propylene glycol, vegetable glycerin, and nicotine on emissions and dynamics of electronic cigarette aerosols

Ventilation and Air Quality in Student Dormitories in China: A Case Study during Summer in Nanjing

Public Needs for Wearable Particulate Matter Devices and Their Influencing Factors

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