To anyone who is not a complete moron I simply say wear a respirator with P100 filters. MSA makes a nice model that does the job even if a POS coughs on you.
properly fitted p100s are easier to breath through than n95s anyway, and are actually pretty comfortable. i used p100s for years in my line of work so maybe im just used to them.
and nothing gives more peace of mind knowing than aint nothing getting through them, basically.
one thing i did do is buy a couple brands with different fittings so i would have a better supply of cartridges in case one brand had a shortage. although if left sealed the carts have a pretty good shelf life.