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Those few smells of extremes (garbage /clean air) make me think they are saturating the sensors.

I'm thinking it could be that we are very attuned to smelling bad smells because it's for safety.

Totally agree with both points! I would love to see what happens with more fine-grained control of the ultrasound.

The real question is that if you make it smell like garbage, will flys show up? Like is this a human experience, or a universal one?