PSA: how to make your own facemask, with information on how to find effective filtering material. There are several good videos on no-sew facemasks, but this article has some very good information for those who are not familiar with using face masks safely (and not contaminating yourself when taking it off) as well as an excellent discussion of adding a filter (see # 8 )
https://www.instructables.com/id/DIY-Cloth-Face-Mask/
Provided in the hope that the decent people here will read and heed, though even the short and basher scum can benefit from this. They can try to avert the karma they have earned.