Study of the micro-climate and bacterial distribution in the deadspace of N95 filtering face respirators

Quan Yang, Hui Li, Shengnan Shen, Guoqing Zhang, Ruiyang Huang, Yong Feng, James Yang, Shiyue Ma

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

It is common for people to use N95 filtering facepiece respirators (FFRs) in daily life, especially in locations where particulate matter (PM2.5) concentration is rising. Wearing N95 FFRs is helpful to reduce inhalation of PM2.5. Although N95 FFRs block at least 95% of particles from the atmosphere, the deadspace of N95 FFRs could be a warm, wet environment that may be a perfect breeding ground for bacterial growth. This work studies the micro-climate features including the temperature distribution and water vapor condensation in the deadspace of an N95 FFR using the computational fluid dynamics (CFD) method. Then, the temperature and relative humidity inside the same type of N95 FFR are experimentally measured. There is a good agreement between the simulation and experimental results. Moreover, an experiment is conducted to study the distribution of bacteria sampled from the inner surface of an N95 FFR after donning.

Original languageEnglish
Article number17382
JournalScientific reports
Volume8
Issue number1
DOIs
StatePublished - Dec 1 2018

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