Testing mobile air purifiers in a school classroom: Reducing the airborne transmission risk for SARS-CoV-2
Testing mobile air purifiers in a school classroom: Reducing the airborne transmission risk for SARS-CoV-2
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DOI：
10.1080/02786826.2021.1877257
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发表时间：
2021-02-02
影响因子：
5.2
通讯作者：
Schrod, J.
中科院分区：
文献类型：
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作者：
Curtius, J.;Granzin, M.;Schrod, J.
SARS-CoV-2通过含病毒的气溶胶颗粒在空气中传播已被确定为Covid-19感染的重要途径。必须采取适当措施预防此类感染，特别是在大量人员聚集在封闭房间的情况下。在这里，我们测试了在一所高中的教室里，在正常上课的时候，运行四个装有高效微粒空气过滤器的空气净化器的效率和实用性。我们在室内两个位置监测了> ~ 3nm颗粒的气溶胶数浓度、10 ~ 10 μ m范围内的气溶胶粒径分布、PM10和CO2浓度。为了比较，我们在邻近的一间没有净化器的教室里进行了类似的测量。在关闭门窗上课时，运行净化器（空气交换率5.5 h(-1)），在不到30分钟的时间内，气溶胶浓度降低了90%以上。整个房间和所有颗粒大小的还原都是均匀的。测量结果还补充了一项计算，该计算估计了一个高度传染性的人在有或没有空气净化器的封闭房间里说话时产生的含病毒气溶胶的最大浓度水平。测量和计算表明，空气净化器可能是一种非常合适的措施，可以大幅降低SARS-CoV-2在空气中传播的风险。我们估计，如果使用空气净化器，总空气交换率为5.7小时（-1），与高传染性的人在封闭的房间里呆2小时，吸入剂量会减少6倍。Copyright (c) 2021美国气溶胶研究协会
Airborne transmission of SARS-CoV-2 through virus-containing aerosol particles has been established as an important pathway for Covid-19 infection. Suitable measures to prevent such infections are imperative, especially in situations when a high number of persons convene in closed rooms. Here we tested the efficiency and practicability of operating four air purifiers equipped with HEPA filters in a high school classroom while regular classes were taking place. We monitored the aerosol number concentration for particles >3 nm at two locations in the room, the aerosol size distribution in the range from 10 nm to 10 mu m, PM10 and CO2 concentration. For comparison, we performed similar measurements in a neighboring classroom without purifiers. In times when classes were conducted with windows and door closed, the aerosol concentration was reduced by more than 90% within less than 30 min when running the purifiers (air exchange rate 5.5 h(-1)). The reduction was homogeneous throughout the room and for all particle sizes. The measurements are supplemented by a calculation estimating the maximum concentration levels of virus-containing aerosol from a highly contagious person speaking in a closed room with and without air purifiers. Measurements and calculation demonstrate that air purifiers potentially represent a well-suited measure to reduce the risks of airborne transmission of SARS-CoV-2 substantially. Staying for 2 h in a closed room with a highly infective person, we estimate that the inhaled dose is reduced by a factor of six when using air purifiers with a total air exchange rate of 5.7 h(-1).Copyright (c) 2021 American Association for Aerosol Research