What situation would most commonly require the use of a Portable Oxygen Bottle?

The most common situation that would require the use of a Portable Oxygen Bottle is during cabin depressurization events. In the event of a sudden loss of cabin pressure, the atmospheric oxygen available in the cabin drops significantly, creating a potentially life-threatening situation for passengers and crew. Portable Oxygen Bottles are essential in these circumstances as they provide immediate supplemental oxygen to individuals who may be experiencing hypoxia, allowing them to breathe properly and maintain necessary oxygen levels until cabin pressure is restored or individuals can safely descend to an altitude where supplemental oxygen is no longer needed.

Understanding the necessity for portable oxygen in such emergencies underscores the importance of emergency preparedness and passenger safety in aviation protocols.