Eglantine, not in a single layer. It has to be folded apparently so you have several layers but I agree with Hetty58 that the best filter is probably a cut up Hepa filter meant for vacuum cleaners. Some are saying that paper coffee filters can do the job but let’s face it nothing , not even surgical masks, are going to give 100% protection against a virus which ,as crafty one pointed out, is smaller than a photon.
Goldenlady1 I agree with you that we all do what we can even if each precaution only makes a small difference.
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