Transport of particulate and gaseous pollutants in the vicinity of a human body

Rim, Donghyun; Novoselac, Atila

doi:10.1016/j.buildenv.2008.12.009

Cited by 147 publications

(127 citation statements)

References 23 publications

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“…The breathing thermal manikin (Donghyun, 2010;Rim, 2009;Rim, 2008) was positioned on a twin size mattress on a bedframe, with the headboard against the centre of the longer wall of the chamber on the opposite side from the exhaust. The manikin's breathing system was adjusted for inhalation through the nose during sleep.…”

Section: Methodsmentioning

confidence: 99%

Experimental assessment of exposure to gaseous pollutants from mattresses and pillows while asleep

Laverge

Novoselac

Corsi

et al. 2013

Building and Environment

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Section: Methodsmentioning

confidence: 99%

Experimental assessment of exposure to gaseous pollutants from mattresses and pillows while asleep

Laverge

Novoselac

Corsi

et al. 2013

Building and Environment

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“…Consequently, weak van der Waals force existing between carpet and particles was found in this study. Regarding the removal force, it was concluded that occupant thermal plume may play a significant role in transporting pollutants from floor to the breathing zone (Rim and Novosela, 2009). The friction force between the tourists' shoes and the carpet would get the flooring charged in comparison with solid wood.…”

Section: The Impact Of Decorative Flooringmentioning

confidence: 99%

Characterizing Particulate Pollutants in an Enclosed Museum in Shanghai, China

Wang

Xiu

Chen

et al. 2015

Aerosol Air Qual. Res.

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The present study reported simultaneous measurements of particle number concentration (PNC), particle mass concentration, water soluble organic carbon (WSOC), organic carbon (OC), elemental carbon (EC), particulate morphology and main elemental properties. The measurements were conducted in a museum located in the downtown area of Shanghai. The impacts of storey, particle size and decorative flooring on particle characteristics inside museum were investigated. Size fractionated PNC in display halls belonging to the same storey exhibited similar daily variations. Particles within the range of 0.3-0.5 µm were identified as the most significant contributors to the overall size distribution measured, as ambient fine particles penetrated through the mechanical ventilation system. Multi-lognormal fitting OC concentrations can be assigned to the presence of tourists in the museum or originate from secondary OC formation. The latter can be estimated by comparing the relationship between OC and EC, as well as OC and WSOC.

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“…In a near vicinity of a person (up to 0.45 m distance from the body), the convective boundary layer dominates the transport of particles upwards to the breathing zone, thus elevating personal exposure for particles released in the immediate perihuman space. [29][30][31] Particles that escape this boundary layer mix with the surrounding room air. 32 In these experiments, when a subject performed seated moderate bodily movements, the contribution to cross-contamination at 1 m distance was 11% of self-inhaled PM 10 mass, and the value dropped further to 7% at 2 m distance.…”

Section: Accepted Articlementioning

confidence: 99%

Emission rates and the personal cloud effect associated with particle release from the perihuman environment

2017

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Inhalation exposure to elevated particulate matter levels is correlated with deleterious health and well-being outcomes. Despite growing evidence that identifies humans as sources of coarse airborne particles, the extent to which personal exposures are influenced by particle releases near occupants is unknown. In a controlled chamber, we monitored airborne total particle levels with high temporal and particle-size resolution for a range of simulated occupant activities. We also sampled directly from the subject's breathing zone to characterize exposures. A material-balance model showed that a sitting occupant released 8 million particles/h in the diameter range 1-10 µm. Elevated emissions were associated with increased intensity of upper body movements and with walking. Emissions were correlated with exposure, but not linearly. The personal PM 10 exposure increment above the roomaverage levels was 1.6-13 µg/m 3 during sitting, owing to spatial heterogeneity of particulate matter concentrations, a feature that was absent during walking. The personal cloud was more discernible among larger particles, as would be expected for shedding from skin and clothing. Manipulating papers and clothing fabric was a strong source of airborne particles. An increase in personal exposure was observed owing to particle mass exchange associated with a second room occupant. Keywords Human emissions, Personal exposure, Activity type, Particle size distribution, Crosscontamination, Particle sources Accepted ArticleThis article is protected by copyright. All rights reserved. Practical implicationsBetter understanding of the nature, scope and significance of human personal clouds is valuable for enhanced prediction and control of personal exposure, which is important in relation to how indoor air quality influences human health. The results of this work are of potential use in indoor air quality models and for improved ventilation design. The work also contributes to a better understanding of human occupants as sources of airborne particles, which could strengthen the design and interpretation of future air pollution exposure studies.

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Transport of particulate and gaseous pollutants in the vicinity of a human body

Cited by 147 publications

References 23 publications

Experimental assessment of exposure to gaseous pollutants from mattresses and pillows while asleep

Experimental assessment of exposure to gaseous pollutants from mattresses and pillows while asleep

Characterizing Particulate Pollutants in an Enclosed Museum in Shanghai, China

Emission rates and the personal cloud effect associated with particle release from the perihuman environment

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