Characterizing particle resuspension from mattresses: chamber study

Boor, Brandon E.; Spilak, Michal; Corsi, Richard L.; Novoselac, Atila

doi:10.1111/ina.12148

Cited by 45 publications

(29 citation statements)

References 81 publications

(117 reference statements)

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“…53,54 There are various source characterization studies made both for consumer products and occupational processes. [55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71] Similarly particle sinks can be assessed according to the model by Mølgaard et al 72 made for indoor air cleaners. Some of these scenarios could potentially be covered with exposure assessment tools such as the ConsExpo REACH tool, but this tool may not be applicable to larger scale industrial exposure scenarios.…”

Section: View Article Onlinementioning

confidence: 99%

Testing the near field/far field model performance for prediction of particulate matter emissions in a paint factory

Koivisto

Jensen

Levin

et al. 2015

Environ. Sci.: Processes Impacts

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A Near Field/Far Field (NF/FF) model is a well-accepted tool for precautionary exposure assessment but its capability to estimate particulate matter (PM) concentrations is not well studied. The main concern is related to emission source characterization which is not as well defined for PM emitters compared to e.g. for solvents. One way to characterize PM emission source strength is by using the material dustiness index which is scaled to correspond to industrial use by using modifying factors, such as handling energy factors. In this study we investigate how well the NF/FF model predicts PM concentration levels in a paint factory. PM concentration levels were measured during big bag and small bag powder pouring.Rotating drum dustiness indices were determined for the specific powders used and applied in the NF/FF model to predict mass concentrations. Modeled process specific concentration levels were adjusted to be similar to the measured concentration levels by adjusting the handling energy factor. The handling energy factors were found to vary considerably depending on the material and process even-though they have the same values as modifying factors in the exposure models. This suggests that the PM source characteristics and process-specific handling energies should be studied in more detail to improve the model-based exposure assessment. Environmental impactThe REACH requires that manufacturers or importers within the European Union must estimate human exposure by all routes for each potential exposure scenario which will then be used in risk assessment. To fulll this regulation several exposure assessment models/tools were developed but their performance in predicting particulate matter exposure has not been tested in work environments. In this study we tested how well a NF/FF dispersion model predicts particulate matter concentrations when source emission potency was estimated using the material dustiness index. It was found that the dustiness index did not describe source emission potency well. To overcome this problem, particle emissions from different sources should be studied with well-controlled work simulations where emission rates are assessed using indoor aerosol models.

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Section: View Article Onlinementioning

confidence: 99%

Testing the near field/far field model performance for prediction of particulate matter emissions in a paint factory

Koivisto

Jensen

Levin

et al. 2015

Environ. Sci.: Processes Impacts

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“…Not only the time spent in bed but also the close proximity of allergen reservoirs (e.g., bedding) to a person’s breathing zone contribute to the site’s importance. Studies have shown that a significant fraction of airborne particles, which are resuspended by human movements in bed, can be inhaled during sleep [11, 12]. Several studies have linked bedroom allergen exposures to allergic sensitization and disease morbidity [13, 14].…”

Section: Introductionmentioning

confidence: 99%

Bedroom Allergen Exposure Beyond House Dust Mites

Salo

Cohn²,

Zeldin

2018

Curr Allergy Asthma Rep

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Purpose of the review: The review provides insight into recent findings on bedroom allergen exposures, primarily focusing on pet, pest and fungal exposures. Recent findings: Large-scale studies and improved exposure assessment technologies, including measurement of airborne allergens and of multiple allergens simultaneously, has extended our understanding of indoor allergen exposures and their impact on allergic disease. Practical, streamlined methods for exposure reduction have shown promise in some settings, and potential protective effects of early-life exposures have been further elucidated through the investigation of specific bacterial taxa. Advances in molecular allergology have yielded novel data on sensitization profiles and cross-reactivity. Summary: The role of indoor allergen exposures in allergic disease is complex and remains incompletely understood. Advancing our knowledge of various co-exposures, including the environmental and host microbiome, that interact with allergens in early life will be crucial for the development of efficacious interventions to reduce the substantial economic and social burden of allergic diseases including asthma.

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“…The transportation mechanism of PM in the sleep environment is simple. First, the dust accumulated on the surface of mattresses, duvets pillows and bedding sheets is resuspended due to human-induced movements on the bed [11]. During the resuspension process the particles become airborne via applying one or more external forces, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The risk of exposure to these particles is their further transport into the BZ where they can be inhaled by the sleeping person. In general, the amount of PM in the BZ that may be inhaled is influenced by several factors: body position of the sleeping person [14], strength of the thermal plume around human body [15, 16, 17] and the size of the particle [11]. …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Comparison between Temperature-Controlled Laminar Airflow Device and a Room Air-Cleaner in Reducing Exposure to Particles While Asleep

et al. 2016

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People spend approximately one third of their life sleeping. Exposure to pollutants in the sleep environment often leads to a variety of adverse health effects, such as development and exacerbation of asthma. Avoiding exposure to these pollutants by providing a sufficient air quality in the sleep environment might be a feasible method to alleviate these health symptoms.We performed full-scale laboratory measurements using a thermal manikin positioned on an experimental bed. Three ventilation settings were tested: with no filtration system operated, use of portable air cleaner and use of a temperature-controlled laminar airflow (TLA) device. The first part of the experiment investigated the air-flow characteristics in the breathing zone. In the second part, particle removal efficiency was estimated. Measured in the breathing zone, the room air cleaner demonstrated high turbulence intensity, high velocity and turbulence diffusivity level, with a particle reduction rate of 52% compared to baseline after 30 minutes. The TLA device delivered a laminar airflow to the breathing zone with a reduction rate of 99.5%. During a periodical duvet lifting mimicking a subject’s movement in bed, the particle concentration was significantly lower with the TLA device compared to the room air cleaner. The TLA device provided a barrier which significantly reduced the introduction of airborne particles into the breathing zone. Further studies should be conducted for the understanding of the transport of resuspended particles between the duvet and the laying body.

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Characterizing particle resuspension from mattresses: chamber study

Cited by 45 publications

References 81 publications

Testing the near field/far field model performance for prediction of particulate matter emissions in a paint factory

Testing the near field/far field model performance for prediction of particulate matter emissions in a paint factory

Bedroom Allergen Exposure Beyond House Dust Mites

A Comparison between Temperature-Controlled Laminar Airflow Device and a Room Air-Cleaner in Reducing Exposure to Particles While Asleep

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