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Performance of Valved Respirators to Reduce Emission of Respiratory Particles Generated by Speaking

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Download Hi-Res ImageDownload to MS-PowerPointCite This:Environ. Sci. Technol. Lett. 2022, 9, 6, 557-560
    Ecotoxicology and Public Health

    Performance of Valved Respirators to Reduce Emission of Respiratory Particles Generated by Speaking
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    Environmental Science & Technology Letters

    Cite this: Environ. Sci. Technol. Lett. 2022, 9, 6, 557–560
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    https://doi.org/10.1021/acs.estlett.2c00210
    Published May 4, 2022
    Copyright © 2022 American Chemical Society
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    Abstract

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    Wearing of face coverings serves two purposes: reducing the concentration of ambient particles inhaled and reducing the emission of respiratory particles generated by the wearer. The efficiency of different face coverings depends on the material, design, and fit. Face coverings such as N95 respirators, when worn properly, are highly efficient at filtering ambient particles during inhalation. Some N95 respirators, as well as other face covering types, include a one-way valve to allow easier exhalation while still maintaining a high efficiency of filtration of inhaled ambient particles. The extent to which these valves decrease the efficiency of filtration of emitted respiratory particles is, however, not well established. Here, we show that different valved N95s exhibit highly variable filtration efficiencies for exhaled respiratory particles. As such, valved N95s may not provide reliable source control of respired particles and their use should be discouraged in situations in which such source control is needed.

    Copyright © 2022 American Chemical Society

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    Supporting Information

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    • Additional experimental details (particle background, participant demographics, and experiments with CO2), a statistical comparison between mask types, and figures showing average particle size distributions, absolute particle emission rates, and the impact of the particle background (PDF)

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    Cited By

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    This article is cited by 1 publications.

    1. William D. Bennett, Steven E. Prince, Kirby L. Zeman, Hao Chen, James M. Samet. A novel method for the quantitative assessment of the fitted containment efficiency of face coverings. Infection Control & Hospital Epidemiology 2023, , 1-4. https://doi.org/10.1017/ice.2022.316
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    Environmental Science & Technology Letters

    Cite this: Environ. Sci. Technol. Lett. 2022, 9, 6, 557–560
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.estlett.2c00210
    Published May 4, 2022
    Copyright © 2022 American Chemical Society
    Request reuse permissions

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