What is the purpose of emergency oxygen at altitude?

• A. To improve passenger comfort
• B. To prevent hypoxia by maintaining adequate oxygen levels for crew
• C. To power the oxygen system
• D. To mask cabin odors

Answer: (B)

Emergency oxygen is there to prevent hypoxia by maintaining adequate oxygen levels for the crew. At high altitudes, the air has less oxygen and cabin pressure can drop, so breathing normal air isn’t enough to keep the brain and organs well-oxygenated. Supplying oxygen ensures the brain stays functioning, decision-making stays sharp, and physical performance isn’t impaired, which is essential for safe flight operations during decompression or other altitude-related issues. It’s not about powering the system or masking odors, and while passengers may notice comfort improves, the primary purpose is life support to prevent hypoxia and preserve crew performance.