Everything you wanted to know about masks (but were afraid to ask)
Where possible, make your purchase directly from a known quality manufacturer's website. In my case, 3M, who's been making high-grade filtration devices for decades. Their website can direct buyers to a link for suppliers of the particular product. In my case, I used the 3M Canadian site to purchase a case of N95 1870+ FDA approved surgical masks, made in Canada, from a local company that they supply. Cost per mask $1.22
Best article yet.