@ikuo1000 It is better than nothing (and it's safe to use every few hours, label usually says every 6) but it's not much better than nothing.
Best-and-brightest nasal spray results are about 60% protective; middle-of-the-values is more like 40% protective.
With a five shot revolver, you'd be playing Russian Roulette with two or three of the five chambers loaded.
With a respirator, you've completely unloaded the revolver; you're at risk from stray bullets from elsewhere.
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