What altitude range typically shows signs of hypoxia?

The altitude range from 12,000 to 15,000 feet is significant because it is here that the partial pressure of oxygen begins to decrease to levels that can induce hypoxia in unacclimatized individuals. At these altitudes, many pilots and passengers may begin to experience symptoms of hypoxia, which can include impaired judgment, decreased reaction times, and reduced cognitive function.

Above 12,000 feet, the oxygen available in the atmosphere is less than what is typically needed for normal physiological function, especially for those who are not acclimatized or using supplemental oxygen. The risk of hypoxia increases as altitude increases, which is why this range is particularly emphasized in aviation training and safety protocols. Understanding this is crucial for pilots to ensure proper measures are taken, such as using oxygen, when flying at these altitudes for extended periods.