I have a Cambridge N99 military mask I got a year or so ago. It is 99% protective against viruses and I'm wearing that out and about now. Your 99.9% should be excellent. Can you reuse it? My mask says 360 hours of protected use. https://cambridgemask.com/I have a dilemma. I've got a pack of Curad Antiviral face masks that are 99.99% effective against the various flu viruses it's been tested against, but obviously not Covid-19. It doesn't say N95 anywhere, but it seems like a pretty effective mask. The box is a couple years old, but they've been stored in a cool place, and the masks are individually sealed in cellophane packages.
I also have a P95 Respirator (like this one) that I bought but never used a couple years ago for a project involving anti-mold fogging.
I need to make one more store run before settling in for a month. I'm tempted to wear the respirator, just to be more safe. Hopefully I won't scare anybody, but truthfully I don't really care. Does anyone have any information or an opinion as to whether one would be better than the other?
Scroll and it shows the size of particles it protects against.
The respirator looks a bit scary, but if you feel comfortable wearing it, why not? It's a new world.