According to Osho, oxygen is produced continuously in nature, which is why gardens, riverbanks, and mountains uplift you, while crowded, enclosed places feel dull because people "drink up" the oxygen. Rather than detailing the chemistry, he emphasizes its impact on awareness: seek oxygen-rich environments and use intense, rapid breathing to quickly shift your inner balance from sleepfulness to wakefulness and clarity.
Nature keeps making fresh air all the time, so go where it’s fresher and breathe strongly to feel awake and alive.