Day is right here about dispersion. We want dispersion; it scatters the bad bitties so we're less likely to slurp them up, or at least slurp up a lot of them up.
And masks are helpful re: transmission. Since we're making fun of my vocab, how I said it here once is that masks somewhat contain your own respirated aerosolized matter. There would be fewer bad bitties beyond one's mask and out in range to be either dispersed by wind or slurped up by ratchet peeps in the clubpool.
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