The Music of the Siphorophenes
Novelette 9,259 words Recommended by 4 award/anthology sources
"I know a nanomask when I see one, especially when the wearer’s making eye contact. There’s something about how the mask melds around the lids — it’s just a little bit stiff, but you have to really know what you’re looking for to tell. But people in nanomasks are trouble, and I never want any of that."
Quasar links out; the story lives on F&SF, where the author gets the click.