What should you do for a passenger who is hyperventilating?

When addressing hyperventilation in a passenger, having them breathe into a bag or their shirt helps to restore carbon dioxide levels in the bloodstream, which can become depleted during hyperventilation. This method allows for rebreathing the exhaled carbon dioxide, which can alleviate symptoms such as lightheadedness and dizziness.

Encouraging deep breathing through their nose may not be effective, as it may not address the rapid rate of respiration typical in hyperventilation. Administering oxygen immediately might not be the best initial response since the issue is not a lack of oxygen but rather an imbalance of gases in the body. Keeping the passenger calm and reclining is helpful for comfort but does not directly address the physiological aspects of hyperventilation that need correction.