Any cheap and serious masks I have are for real breathing hazards, like painting, plaster dust, yard/garden blowouts, compressed air tool stink, welding and soldering up close etc etc
and let's not forget eye and ear protection in on the deal too
Anything beyond that calls for a proper self contained breathing rig coupled to a hazardous waste outfit, or NASA astro suit, END OF STORY, to keep real nasties
and aliens out.
I'm not fooling myself to believe if I walk around with a mask like all the clueless idiots I see breathing back their own moist exhales
+
that it's going to keep out any real deal virus that will seep into a body one way or the other, sooner or later,
or NEVER at all if this turns out to be yet ANOTHER global panic bandwagon resulting in financially shafting battling families and struggling businesses even more.
Time will tell either way, and the clock is ticking..
in the meantime, if I need to protect my airways from the occasional black smoke belching car, truck or bus, or billowing high rise
dog box apartment construction dust,
a pocketed tissue, hanky or clean rag is a good enough short term PROVEN fix, cheap and portable
and good enough to play the corona game too, whilst watching sickening hoarders empty the shelves, keeping a straight 'normal shopper' face
= (expletive) idiots