the smell of electricity is actually the smell of ozone, which occurs when high voltages cause dioxygen molecules to become ozone molecules (o2 to o3) and the reason why we can smell it is due to the evolutionary advantage of being able to tell when a thunderstorm is coming. its also why we can smell petrichor (an oil that plants secrete during rainstorms) so intensely, which is often called the "wet concrete" or "wet asphalt" smell since the oil pools and accumilates in large flat spaces, like roads and parking lots.

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