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Cloth masks, medical masks and FFP2 masks - what really makes the difference?

New corona rules have been in effect since January 19, 2021. Only medical or FFP2 masks may be worn on public transport and in shops until February 14th. Of course, that hits startups like swapface hard. But does that even bring anything? According to scientific study from the USA you can achieve a filter efficiency of 98% with a double-layer cotton mask - 1% less than with a medical mask. In addition, the fit of the mask is actually much more important than the small filter difference between the different makes, because as the study found, even small gaps between mask and skin can reduce the filter effect of the mask by 50%. And then what difference does it make...

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