I always get confused about the public's choice for masks.

Often they choose exhalation masks, i.e. nursing masks which protect others instead of inhalation masks designed to protect themselves

Why not use a N100 mask?

Have you considered the relative protective factors of different styles of protection, face mask Vs half mask Vs full mask Vs power assist Etc.?

Have you considered 'mask fit'. All masks don't fit all people by a long shot. Probably more important than anything else?

OSHA Publication

I have spent a career designing respiratory protection systems, S10 mask, nuclear bunkers etc. Still the best advice is 'RUN AWAY', best protection possible.