At what altitude do you need oxygen?
Supplemental oxygen is required above 10,000 feet
Last updated on 19 May 2023
Yes, oxygen is lower in higher altitudes
At 12,500 feet the air becomes thinner and oxygen becomes lower making it difficult to breathe.
You will likely feel nauseous and lightheaded. You may vomit and have a headache. Different levels of altitude sickness have different symptoms: Symptoms of mild, short-term altitude sickness usually begin 12 to 24 hours after arriving at high altitude
Humans can certainly experience reverse altitude sickness, known as high-altitude de acclimatisation syndrome (HADAS). When people who live at low altitude have adjusted to a high-altitude, low-oxygen environment, they can get any of a large number of possible symptoms of HADAS when returning to a lower altitude.
Avoid visiting places on the same day when you get to higher altitudes. Acclimatise and only then get to places which requires climbing.
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