I'm sure as heck no Einstein nor do I know anything about quantum physics or relativity. But... no, I don't think that's the answer.
I'm more inclined to believe gasses and everything else is/are denser at or below sea level because my boss is at sea level. He is an inestimably dense individual. I strongly suspect that, if he were to ever climb to the top of mount everest, the entire climate would invert... would probably even rain upwards.