Respirator?

Hey folks, as you can tell from the handle I'm just now getting into casting my own silver using .999FS shot, bars, and rounds. I've got everything I should need, aside from the big question. I'm planning on working outside and from what I've been told I don't need a respirator since I'm using .999 fine silver. Obviously with Covid getting a respirator in my small town is impossible, everyone is out and won't be getting more till this situation is over. Thoughts, opinions, and experiences are greatly appreciated!

No relax, anywhere ventilated will do.
If using respirators, they need to be of a specification for the job in hand, not just any old mask. Dennis.

Depending on what your casting with, investment powder is pretty nasty stuff it has silica in it and is a very fine powder, I would avoid breathing this in if your using it.