There's KN95's and FFP2's, essentially equivalents to the US N95 standard, that have been available for use this whole time. The European airlines are now requiring FFP2's, as are most indoor places in Austria. I certainly don't like them, especially if I'm exerting myself, but the US is not in good shape at the moment and part of it could be people using bandannas and thinking that will do the trick. Since I'm vaccinated, I use a two layer fabric plus a filter layer and figure if I watch out where I'm going, that's good enough, but I was not so sanguine before I was vaccinated.