FFP2 / N95 respirators - 90-something percent, medical "blue" masks - 80 percent, home-made piece-of-cloth style ~ 50%.
Wearing sunglasses is encouraged too. Both to stop the load if someone sneezes at you and discourage from touching your eyes.
Medical mask - 96,4%.
Home made mask - 60-96% (depends on cloth and sewing).
https://www.researchgate.net/publication/258525804_Testing_t...
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https://phonetub.com/products/100-disposable-face-surgical-m...
The main problem with blue masks and home made is that they tend to get wet from breath and their effectiveness go down the drain.
FFP2 / N95 respirators - 90-something percent, medical "blue" masks - 80 percent, home-made piece-of-cloth style ~ 50%.
Wearing sunglasses is encouraged too. Both to stop the load if someone sneezes at you and discourage from touching your eyes.