At the top of the medical mask hierarchy is the N95, made from non-woven polypropylene fiber and so named because it removes 95% percent of particles down 0.3 microns.
But a 2010 study found that homemade masks, depending on their fabric, blocked between 10 and 40 percent of particles of 1 micron.
Experts say homemade masks are better than nothing, especially if people find themselves in a confined space like a MAX train or bus. Beyond the protection they offer to those wearing them, they also reduce the likelihood that people with the virus, who may not be showing symptoms, will spread it to others.
Watch the video to learn two ways to make a face mask (without sewing) using paper towels or a scarf.
Read more about this story at The Oregonian/OregonLive: https://www.oregonlive.com/coronavirus/2020/04/are-homemade-masks-helping-for-some-uses-but-theyre-no-replacement-for-proper-equipment-authorities-say.html