07-13-2021, 12:02 AM
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from my research, "a ghost of gnats" is just another phrase besides "a cloud of gnats"
ghost as a collective noun and synonym for cloud? Not buying it 

the streetlit dance of gnats (possibly) but dance of streetlit ghosts / of gnats (nope).
If you wanted, perhaps a gossamer of gnats?
And petrichor is your only instance of smell/scent in the piece, everything else is sight and sound.
Best, Knot
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