IRSST - Institut de recherche Robert-Sauvé en santé et en sécurité du travail

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April 23, 2024

Evaluating the performance of an N95 filter against ultrafine particles, including nanoparticles, with a cyclic airflow that simulates the breathing of workers

Abstract

Nanoscale ultrafine particles (UFPs) are produced by various combustion processes (forest fires, heating, diesel exhaust, welding fumes, etc.) and the mechanical processing of materials. The industrial production and use of UFPs, including nanoparticles, appears to be increasing and several toxic effects have been documented. Although prevention measures aimed at eliminating UFPs at source should be favoured, in some circumstances the use of respiratory protective equipment is unavoidable.
This project aims to assess the efficacy of an N95 filter at capturing UFPs in experimental conditions similar to actual workplace conditions and by imitating the breathing of a human being.
In an earlier study, the research tem developed a procedure for measuring the efficacy of N95 filters under constant flow conditions. For this project, the scientists want to integrate a cyclical flow pump in order to determine the penetration rate of ultrafine particles as a function of particle size, cyclic aspiration, relative humidity and exposure time. A better understanding of the behaviour of protective equipment with respect to UFPs is a key issue due to the ongoing development of nanotechnology.

Produced Under this Project

  • Particules ultrafines
    Quelle est l'efficacité d'un filtre N95 pour protéger les travailleurs ? Volume 30, n0 1

  • Peak and frequency inhalation flow impact on NP penetration through N95 filters

    Mahdavi A., Ali Bahloul, Ostiguy C.

    Source :

    in The Art + Science of Professional Judgement : American Industrial Hygiene Conference and Exhibition / AIHce 2013 (May 18-23, 2013 : Montréal, Canada), 2013

  • Contribution of breathing frequency and inhalation flow rate on performance of N95 filtering facepiece respirators

    Mahdavi A., Ali Bahloul, Haghighat F., Ostiguy C.

    Source :

    Annals of Occupational Hygiene, vol. 58, no 2, 2014, p. 195-205

  • Advancement in Quebec research on the prevention of risks related to occupational exposure to nanomaterials

    Dolez P., Cloutier Y. , Noël A., Tabet L., Gautrin D., Debia M., L'Espérance G., Hallé S., Ali Bahloul, Vinches L.

    Source :

    Relations industrielles/Industrial Relations, vol. 68, no 4, 2013, p. 623-642

  • Evaluation of N95 filtering facepiece respirator efficiency with cyclic and constant flows

    Ali Bahloul, Mahdavi A., Haghighat F., Ostiguy C.

    Source :

    Journal of Occupational and Environmental Hygiene, vol. 11, no 8, 2014, p. 499-508

  • Performances des pièces faciales filtrantes N95 - Comparaison de débits constants et cycliques

    Mahdavi A., Brochot C., Ali Bahloul, Haghighat F., Ostiguy C.

    Source :

    in Bien s'outiller pour intervenir: se développer, se spécialiser, se renouveler : Congrès de l'Association québécoise pour l’hygiène, la santé et la sécurité du travail / AQHSST, (36e : 7-9 mai, 2014 : Beaupré, Canada), 2014

  • Performances des pièces faciales filtrantes N95 à débit constant et cyclique - Effet du temps de colmatage et de l'humidité relative

    Brochot C., Mahdavi A., Ali Bahloul, Haghighat F., Ostiguy C.

    Source :

    in Bien s'outiller pour intervenir: se développer, se spécialiser, se renouveler : Congrès de l'Association québécoise pour l’hygiène, la santé et la sécurité du travail / AQHSST, (36e : 7-9 mai, 2014 : Beaupré, Canada), 2014

  • Validation of a laboratory test bench for the efficiency of an N95 filtering face piece, using simulated occupational exposure

    Brochot C., Djebara A., Haghighat F., Ali Bahloul

    Source :

    (2015). Journal of Environmental & Analytical Toxicology, 5(4), 1-11. doi: 10.4172/2161-0525.1000286

  • Validation du banc de test des pièces faciales filtrantes N95 - Comparaison des mesures de performances avec une exposition professionnelle simulée

    Brochot C., Djebara A., Haghighat F., Ali Bahloul

    Source :

    Communication présentée à Le risque chimique : méthodes et techniques innovantes, Nancy, France.

  • Efficiency of an N95 filtering facepiece respirator to capture ultrafine particles under cyclic flows, and comparison with constant flows

    Brochot C., Mahdavi A. R., Ali Bahloul, Haghighat F.

    Source :

    Proceeding of 4th Workplace and Indoor Aerosols Conference (Aerosols 2016), Barcelone, Spain. [Poster].

  • Particle loading time and humidity effects on the efficiency of an N96 filtering facepiece respirator model under constant and inhalation cyclic flows

    Mahdavi A. R., Haghighat F., Ali Bahloul, Brochot C., Ostiguy C.

    Source :

    (2015). The Annals of Occupational Hygiene, 59(5), 629-640. doi: 10.1093/annhyg/mev005

  • Efficiency of a N95 filtering facepiece to capture nanoparticles under constant and cyclic flows

    Brochot C., Mahdavi A., Haghighat F., Ali Bahloul

    Source :

    (2016). Communication présentée à 4th Workplace and Indoor Aerosols Conference, Barcelone, Espagne.

  • Performances de pièces faciales filtrantes N95 à débits constant et cyclique : effet du temps de colmatage et de l’humidité relative

    Brochot C., Mahdavi A., Ali Bahloul, Haghighat F., Ostiguy C.

    Source :

    (2015). Communication présentée à AQHSST, Beaupré, QC.

  • Particle loading time and humidity effects on the efficiency of an N95 filtering facepiece respirator model under constant and inhalation cyclic flows

    Mahdavi A., Haghighat F., Ali Bahloul, Brochot C., Ostiguy C.

    Source :

    (2015). The Annals of Occupational Hygiene, 59(5), 629-640. doi: 10.1093/annhyg/mev005

  • Validation of laboratory test bench: Comparison of performances with a simulated occupational exposure

    Brochot C., Djebara A., Haghighat F., Ali Bahloul

    Source :

    (2015). Journal of Environmental & Analytical Toxicology, 5(4), 286. doi: 10.4172/2161-0525.1000286

Additional Information

Type: Project
Number: 2011-0035
Status: Completed
Year of completion: 2015
Team: