At what altitude does hypoxia become a significant risk to pilots?

Hypoxia, which refers to inadequate oxygen supply to the body, becomes a significant risk to pilots above 5,000 feet. At lower altitudes, the atmospheric pressure allows for sufficient oxygen levels to be maintained for normal physiological functioning. However, as altitude increases, the partial pressure of oxygen decreases, leading to a reduced availability of oxygen for the body.

Starting around 5,000 feet, pilots may begin to experience symptoms of hypoxia, particularly if they exert themselves physically or if they have pre-existing medical conditions that affect oxygenation. The risk escalates with altitude, making it crucial for pilots to be vigilant and take necessary precautions, such as using supplemental oxygen, when flying at higher elevations.

This understanding underscores the importance of altitude awareness and the need for proper oxygen equipment and procedures in aviation to prevent hypoxia-related incidents.