The characterization that the plague was carried "on the wind" is a typical archaic reference. The recognition of means of transmission is a modern discovery. I have seen the Spanish Flu from 1918 characterized in period pieces as black clouds and smog. Tolkien would not attempt to incorporate concepts such as aerosol transmission into his mythos; they would be out of place.
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Beleriand, Beleriand,
the borders of the Elven-land.
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