What a curious claim. I'd expect transmission to drop dramatically via either mechanism, outdoors.
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Why would HEPA filters work? They aren't between you and the person you are speaking with, should be irrelevant for droplets. How could there be so much overdispersion with a mainly droplet, thus, ballistic trajectory, particles?
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I'm not arguing against aerosol transmission, Zeynep, as you'd know if you'd read the thread. I'm persuaded that aerosol transmission occurs and that it is a significant component of total transmission. But the evidence that transmission is only or mainly aerosol is weak.
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Yes! Great questions!
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