Ultrafine particle removal and generation by portable air cleaners

Waring, Michael S.; Siegel, Jeffrey A.; Corsi, Richard L.

doi:10.1016/j.atmosenv.2008.02.011

Cited by 174 publications

(135 citation statements)

References 25 publications

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“…Ozone may also be generated indoors in large quantities from devices marketed as "air purifiers" (Boeniger 1995;Hubbard et al 2005). Such devices are commonly used to remove odors related to secondhand tobacco smoke, despite the growing body of evidence showing that they generate products that are more toxic and/or irritating than their precursors (Phillips and Jakober 2006;Waring et al 2008). …”

Section: Introductionmentioning

confidence: 99%

Tobacco smoke aging in the presence of ozone: A room-sized chamber study

Petrick

Sleiman

Dubowski

et al. 2011

Atmospheric Environment

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Exposure to tobacco pollutants that linger indoors after smoking has taken place (thirdhand smoke, THS) can occur over extended periods and is modulated by chemical processes involving atmospheric reactive species. This study investigates the role of ozone and indoor surfaces in chemical transformations of tobacco smoke residues. Gas and particle constituents of secondhand smoke (SHS) as well as sorbed SHS on chamber internal walls and model materials (cotton, paper, and gypsum wallboard) were characterized during aging. After smoldering 10 cigarettes in a 24-m 3 room size chamber, gas-phase nicotine was rapidly removed by sorption to chamber surfaces, and subsequently re-emitted during ventilation with clean air to a level of ~10% that during the smoking phase. During chamber ventilation in the presence of ozone (180 ppb), ozone decayed at a rate of 5.6 h -1 and coincided with a factor of 5 less nicotine sorbed to wallboard. In the presence of ozone, no gas phase nicotine was detected as a result of reemission, and higher concentrations of nicotine oxidation products were observed than when ventilation was performed with ozone-free air. Analysis of the model surfaces showed that heterogeneous nicotine-ozone reaction was faster on paper than cotton, and both were faster than on wallboard. However, wallboard played a dominant role in ozone-initiated reaction in the chamber due to its large total geometric surface area and sink potential compared to the other substrates. This study is the first to show in a roomsized environmental chamber that the heterogeneous ozone chemistry of sorbed nicotine generates THS constituents of concern, as observed previously in bench-top studies. In addition to the main oxidation products (cotinine, myosmine and N-methyl formamide), nicotine-1-oxide was detected for the first time.Petrick et al.

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Section: Introductionmentioning

confidence: 99%

Tobacco smoke aging in the presence of ozone: A room-sized chamber study

Petrick

Sleiman

Dubowski

et al. 2011

Atmospheric Environment

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“…Portable air cleaners for home and office usage utilize various techniques depending on which pollutants they target (Zhang et al 2011). No air cleaner removes all pollutants, and some even produce harmful by-products, such as ozone (Niu et al 2001;Britigan et al 2006;Waring et al 2008). Hence, air cleaners should not replace ventilation, but they may supplement it.…”

Section: Introductionmentioning

confidence: 99%

A New Clean Air Delivery Rate Test Applied to Five Portable Indoor Air Cleaners

Mølgaard

Koivisto

Hussein

et al. 2014

Aerosol Science and Technology

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Air pollution has been recognised as one of the major risk factors for the global burden of disease. In modern society the majority of the exposure occurs indoors where people spend most of their time. Indoor air quality may be improved with portable air cleaners utilizing various cleaning techniques, such as filtration, electrostatic precipitation, and ionization. The objective of this study was to quantify air cleaner particle removal by particle size resolved clean air delivery rates (CADR). This was obtained by utilizing particle concentration measurements and indoor aerosol modeling. Our test protocol was applied to five air cleaners designed for household and office use. For particles with diameters above 100 nm and at the chosen settings, the CADR was around 40 m 3 /h for an ion generator, around 70 m 3 /h for an electrostatic precipitator, and ranging from 100 to almost 300 m 3 /h for the three filter-based air cleaners. Similar performances were obtained for ultrafine particles, except for the ion generator that performed better in this size range.

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“…In 54 some circumstances, indoor sources may be present including photocopiers and printers (Tuomi 55 et al, 2000), air cleaners that produce ozone as a byproduct (Waring et al, 2008), or ozone However, evaluation of airway effects in mice exposed to model indoor air mixtures containing 68 limonene/ozone reaction products showed non-cumulative sensory irritation as a key effect, but 69 no observation of airway inflammation, the latter hypothesized to be an underlying mechanism indoor air quality models of the reactive uptake of ozone on building interior surfaces.…”

mentioning

confidence: 99%

Ozone reaction with interior building materials: Influence of diurnal ozone variation, temperature and humidity

Rim

Gall

Maddalena

et al. 2016

Atmospheric Environment

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Please cite this article as: Rim, D., Gall, E.T., Maddalena, R.L., Nazaroff, W.W., Ozone reaction with interior building materials: influence of diurnal ozone variation, temperature and humidity, Atmospheric Environment (2015Environment ( ), doi: 10.1016Environment ( /j.atmosenv.2015 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. for fresh materials are in the respective ranges of (1.7-2.7) × 10 -5 , (2.8-4.7) ×10 -5 , and (3.0-4.5) 34× 10 -5 for ceiling tile, painted drywall, and carpet tile. The reaction probability decreases by 7% 35 to 47% across the three test materials after two 8-h periods of ozone exposure. Measurements 36 with the samples from an occupied office reveal that deposition velocity can decrease or increase 37 with time. Influence of temperature and humidity on ozone-surface reactivity was not strong.

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Ultrafine particle removal and generation by portable air cleaners

Cited by 174 publications

References 25 publications

Tobacco smoke aging in the presence of ozone: A room-sized chamber study

Tobacco smoke aging in the presence of ozone: A room-sized chamber study

A New Clean Air Delivery Rate Test Applied to Five Portable Indoor Air Cleaners

Ozone reaction with interior building materials: Influence of diurnal ozone variation, temperature and humidity

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