Is there more oxygen in Tibet in rainy days or sunny days?

Of course, in sunny days and rainy days, the pressure decreases and some oxygen is dissolved in water. On the other hand, without sunlight, plants can't carry out photosynthesis, and they will suck in oxygen and release carbon dioxide, so they lack oxygen.

On sunny days, at dawn, the oxygen content decreases, and after the sun rises, the oxygen content gradually increases. This situation is everywhere, but it is generally difficult to feel it.