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A Pilot Study of Nanoparticle Levels and Field Evaluation of N95 Filtering Facepiece Respirators on Construction Sites
Little attention has been paid to the generated submicron ultrafine and nanoparticles and their exposure levels on construction jobsites. This information is needed because cytotoxicity of nanoparticles is well known now. In addition, the performance of particulate respirators generally used by construction workers has never been evaluated in field conditions against ultrafine and nano-sized particles. We hypothesized that workers on construction jobsites are exposed to high levels of nanoparticles and current NIOSH-recommended N95 respirators may not provide them adequate protection against aerosolized...
Market surveillance of FFP3 disposable respirators
Filtering Facepieces (FFPs) are disposable Respiratory Protective Equipment (RPE) for protection against dusts, particles and aerosols. They are often referred to as 'disposable dust masks', are widely used, and generally require no cleaning or maintenance. They are available in three classes: FFP1, FFP2 and FFP3, with the higher numbers corresponding to better filtering efficiency. As with all types of Personal Protective Equipment (PPE) sold in the UK, they must comply with the EU PPE Directive 89/686/EEC. It is the responsibility of the manufacturer or person placing the RPE on the European...
Évaluation de l’efficacité d'un filtre N95 contre des particules ultrafines, dont les nanoparticules, en mode de débits d'air constant et cyclique simulant la respiration des travailleurs
On trouve des particules ultrafines (PUF), soit des particules dont le diamètre (Dp) est inférieur à 100 nm, dans de nombreux milieux de travail industriels, où leur inhalation peut, à long terme, causer de graves problèmes de santé. Dans certains contextes, les mesures d'ingénierie et les contrôles administratifs sont insuffisants pour protéger adéquatement les travailleurs contre l'exposition aux PUF. Un dispositif de protection personnel est alors requis, et les appareils de protection respiratoire à pièce...
Comparison of two quantitative fit-test methods using N95 filtering facepiece respirators
Current regulations require annual fit testing before an employee can wear a respirator during work activities. The goal of this research is to determine whether respirator fit measured with two TSI Portacount instruments simultaneously sampling ambient particle concentrations inside and outside of the respirator facepiece is similar to fit measured during an ambient aerosol condensation nuclei counter quantitative fit test. Sixteen subjects (ten female; six male) were recruited for a range of facial sizes. Each subject donned an N95 filtering facepiece respirator, completed two fit tests in random...
The Use of Respirators to Reduce Inhalation of Airborne Biological Agents
Respiratory protection devices are an important element of an overall contagion control strategy when infectious biological aerosols are potentially present in an occupational environment. In health care facilities, N95 class FFR certified by the National Institute for Occupational Safety and Health (NIOSH) are typically the minimum class of respiratory protection recommended. In contrast, studies exist that suggest that surgical masks normally used in health care settings may be equally effective in reducing disease transmission. The “respirator versus surgical mask” debate continues...
Développement de procédure de mesure de l'efficacité des filtres N95 à capturer les nanoparticules
La croissance phénoménale des produits nanotechnologiques soulève des inquiétudes quant à l’exposition humaine aux nanoparticules ainsi produites, lesquelles peuvent poser des risques pour la santé et la sécurité des travailleurs. Outre l’élimination à la source ou la diminution de l’exposition, la ventilation, locale ou générale, et la protection personnelle, en particulier respiratoire, sont les moyens de contrôle à privilégier dans ce contexte. Or, le bon fonctionnement de...
NIOSH Investigation of 3M Model 8000 Filtering Facepiece Respirators
NIOSH investigators assessed sample units of the 3M Model 8000 FFRs received from the CDPH stockpile in order to check for any non-compliance with the NIOSH approval requirements for filtration efficiency and airflow (breathing) resistance. The goal was to determine if the respirators were manufactured in accordance with the NIOSH-approved quality assurance plan and had appropriate construction and workmanship. The investigation also evaluated respirator performance when fit tested on a panel of human test subjects representing a variety of facial dimensions. The evaluation revealed that the performance...

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