Why can't humans breathe air directly on Pandora, even though there are oceans and trees that support oxygen-producing microorganisms? This is a very insightful question. You're absolutely right: Pandora visually looks very lush, full of green plants, and has oceans, which means there is indeed massive oxygen (O2) production there. In fact, Pandora's atmosphere is actually rich in oxygen, even slightly higher in concentration than Earth's. However, the problem isn't a lack of good stuff (oxygen), but rather an excess of bad stuff (toxic gases). Here's a scientific explanation (based on official Avatar lore) for why humans can't breathe there without a mask (Exopack): #marvel #avatar #Avatar3 #AvatarFireAndAsh #mcu