The phenomenon is due to Paschen's law (there is a good wikipedia article on it). The breakdown potential of a gas is minimized at some pressure, and in the case of air, that pressure is < 1 atm, and corresponds to a specific altitude.
I can't go into much detail, but we are working on addressing this in a couple different ways in our insulation system design.
I can't go into much detail, but we are working on addressing this in a couple different ways in our insulation system design.