Options besides N95s include a well-fitting three-layer cloth mask with a non-woven polypropylene filter layer, medical masks that are ASTM certified, and wearing a good-fitting cloth mask over a medical or procedure mask.
Adding layers of filtration by double masking is a way of using the masks that we already have, possibly to better effect.
Everything you need to know about non-woven polypropylene, which is recommended for use as a filter in cloth face masks.
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