市场抽样口罩对空气PM2.5防护效果研究

STUDY ON PROTECTION EFFECT OF MARKET SAMPLED MASKS TO PM 2. 5

目的研究市场上常见的口罩对细颗粒物（PM 2.5）的防护效果,以指导消费者选择和使用。方法采用称重法,对环境空气中PM 2.5和经口罩阻隔后的空气中PM 2.5浓度进行监测,以评价各种口罩对PM 2.5阻隔效率。结果在流量100 L/min条件下,检测了从市场抽样的8种口罩,在空气PM 2.5低于270μg/m3时,有7种口罩能将空气PM 2.5浓度降低到75μg/m3以下,符合二类区域标准要求。一次性外科口罩的阻隔效率低于10%,其他7种口罩的阻隔效率介于72%~97%之间。结论一次性外科口罩对PM 2.5几乎没有防护作用,其他7种口罩对PM 2.5有一定的防护效果。

Objective To investigate the protection effect of several popular masks to PM 2. 5 in the market. Methods Weighing method was adopted to monitor the PM 2. 5 average concentration in the ambient air and the air obstructed by masks in order to evaluate protection effect. Results 8 kinds of popular masks were tested. When the air flow rate was controlled to 100 L/min, the concentration of PM 2. 5 in the air could be reduced to 75 μg/m3 by 7 kinds masks while the concentration of PM 2. 5 in the ambient air was below 270 μg/m3 , which was according with the demand of GB 3095 - 2012. The obstruction efficiency of these 7 masks was between 72% -97%, except that of the disposable surgery mask whose ef- ficiency was below 10%. Conclusion There was hardly any protection effect of the disposable surgery mask, while the other 7 masks performed certain protection to PM 2. 5.