What precaution should be taken for a passenger experiencing airsickness?

For a passenger experiencing airsickness, loosening tight clothing is an effective precaution. This action can help alleviate discomfort and improve the passenger's overall sense of well-being. Tight clothing can restrict circulation and contribute to feelings of nausea or distress, which may worsen airsickness. By loosening clothing, airflow and comfort are improved, possibly allowing the passenger to feel more at ease.

Providing ginger ale, while it may help some passengers with nausea, is not universally effective for all individuals experiencing airsickness. Increasing cabin pressure is generally not feasible or relevant, as cabin pressure is managed by aircraft systems and is unlikely to alleviate symptoms of airsickness. Closing air vents could potentially create a stuffy or uncomfortable environment, which may aggravate the situation rather than alleviate it. Therefore, loosening tight clothing serves as a practical and immediate way to support a passenger who is feeling unwell due to airsickness.