Using the size of aerosolized droplets (0.35-10um) and the mass of human skin (20 lbs) would knock two orders of magnitude off, and drop the floor estimate to 50 megavolts.
For anyone wondering what a 50MV source looks like, one was actually built out in the desert near Joshua Tree in '54. Strangely, it was built for longevity research. Well, that and UFOs and anti-gravity, because of course:
"The Multiple Wave Oscillator is a combination of a high voltage Tesla coil and a split-ring resonator that generates ultra wideband electromagnetic frequencies."
The ionization of the air in the main room was quite intense, with plasma freely forming coronas.
Once the pandemic is over, you can drive out to get a 'sound bath' in the room, if you are so inclined.
