口罩湿了,还可以戴吗?

夏天了。除了身上湿漉漉、黏糊糊的,还有一个地方,也同样闷热潮湿——你的口罩里

沾染了汗水/水汽的口罩,还有效吗?潮湿闷热的环境会不会降低它的过滤效率?对此,科学家们“干湿分离”,对口罩进行了研究和测试。

研究人员让22名测试者分别戴了三个小时的 自制棉布口罩 、医用口罩、N95口罩,并测试了口罩在【使用前】和【使用后】的效率;同时测试了人们在佩戴口罩时,【口罩内】、【口罩外】分别拦截了多少颗粒物。

测试过程大概长这样⬇️

测试后发现:DIY棉布口罩在变湿?后,效率提高了;(6%⬆️)

潮湿?对于医用口罩并无明显影响;

但对N95口罩,潮湿?可能降低了口罩的过滤效果,但由于数值极小,也可能是误差……

需要注意的是,测试过程中的「潮湿」,是人们呼吸产生的水汽和汗水。如果是淋雨那种大湿特湿,结论应该会不一样。

延伸阅读:一只N95能戴多久?

Bottom Line
结论
潮湿(汗水?、口水、哈气)不会对口罩的过滤效果产生多少影响。如果硬要说有影响,DIY棉布口罩在3小时后的过滤能力提高了6%;以及,滋生细菌。
Smart Air

夏天到了,为了避免滋生更多细菌,你可以这么做:

  1. 摘下后不要放在兜里;
  2. 放在桌面或者通风的地方,晾干;
  3. 放的时候,口罩内侧朝外,因为里面容易湿

祝您安全呼吸!

 

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nospam
2023-06-29 5:39 am

I skimmed the wet mask study but it doesn’t contain any reference to wet masks or humidity. 😕

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