Medical mask - 96,4%.
Home made mask - 60-96% (depends on cloth and sewing).
https://www.researchgate.net/publication/258525804_Testing_t...
https://cdn.shopify.com/s/files/1/0080/6830/0851/products/6_...
https://www.123rf.com/photo_138981777_stock-vector-person-we...
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.
Medical mask - 96,4%.
Home made mask - 60-96% (depends on cloth and sewing).
https://www.researchgate.net/publication/258525804_Testing_t...