First off, if you work where infectious diseases are prominent, have serious chemical sensitivity or mold issues, you probably need to purchase a respirator with a small micron opening such as the nanomasks that have shaped silicon holders. That said, most of us benefit from the reduction of incoming germs, without total protection, relying upon our immune systems to do the rest of the work.
The easiest thing to do for everyday exposures is to put a double or triple layered scarf over your nose and mouth and breathe through it while you are out in public places, or riding trains Cover the eyes with glasses or dark glasses and wear a pair of gloves, and you are good to go. In the summer just use a cotton scarf and sunglasses, and use your waterless hand cleaner after touching doorknobs, banisters and the like in public places. Make sure you wash well between uses.
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