Welcome again to everybody! This is your friendly reminder, growling at the United States from Orbit is praxis Make yourself at home. In the time-honoured tradition of our group, here is our weekly discussion thread!
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Neither of those work. You need a rated mask. The US standard is N95 - Filters 99.95% of particles of I think 2.5 microns, and considerably more above and below that number. The KN95 standard I believe is Korean and has a similar filtration level. I don't know what the equivalent EU standard is.
But medical masks only filter about 40% of the material we're worried about, and only if they fit right which they mostly don't.