Annals of Occupational Hygiene Advance Access published online on March 7, 2008
Annals of Occupational Hygiene, doi:10.1093/annhyg/men005
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Respiratory Performance Offered by N95 Respirators and Surgical Masks: Human Subject Evaluation with NaCl Aerosol Representing Bacterial and Viral Particle Size Range
1 Department of Environmental Engineering and Science, Feng Chia University, Taichung, Taiwan, Republic of China
2 Center for Health-Related Aerosol Studies, Department of Environmental Health, University of Cincinnati, P.O. Box 670056, Cincinnati, OH 45267-0056, USA
* Author to whom correspondence should be addressed. Tel: +513-558-0571; fax: +513-558-2263; e-mail: reponeta{at}ucmail.uc.edu
Objectives: This study aimed at determining the protection factors (PFs) provided by N95 filtering facepiece respirators and surgical masks against particles representing bacterial and viral size ranges (aerodynamic size: 0.04–1.3 µm).
Methods: The protection levels of N95 filtering facepiece respirators (four models) and surgical masks (three models) were investigated while they were donned by 12 subjects performing the OSHA (US Occupational Safety and Health Administration) fit-testing exercises in a test chamber.
Results: About 29% of N95 respirators and 
100% of surgical masks had PFs <10, which is the assigned PF designated for this type of respirator by the OSHA. On average, the PFs of N95 respirators were 8–12 times greater than those of surgical masks. The minimum PFs were observed in the size range of 0.04–0.2 µm. No significant difference in PF results was found between N95 respirators with and without an exhalation valve.
Conclusions: The study indicates that N95 filtering facepiece respirators may not achieve the expected protection level against bacteria and viruses. An exhalation valve on the N95 respirator does not affect the respiratory protection; it appears to be an appropriate alternative to reduce the breathing resistance.
bacteria • exhalation valve • protection factor • respirator • virus
Received March 16, 2007; in final form December 21, 2007
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