So are HEPA filters in all air purifiers. Pick your battles. First you don't want to be sick/die/cause your elder relative to die by infecting them. Then once

So are HEPA filters in all air purifiers. Pick your battles. First you don't want to be sick/die/cause your elder relative to die by infecting them. Then once you are not dead you don't want to get into your body substances that clearly have no business being there and can make you sick slower and less noticeably. I'm guessing you would want to run a filter/wear a mask if there's a good reason and not do it when there isn't.