Whether a mask can have a higher filtration efficiency, and its structure design, as well as the quality of the filter material, there are related.
Secondly, when choosing a mask, you can't just look at its filter efficiency value, but also need to see does it fit your face, it is best to choose a regulatory mechanism and relatively flexible mask, such as LIFAair.
Video link:
https://youtu.be/uraWnrDXiDs
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