Which of the following is a common atmospheric hazard to monitor for in a re-entry scenario?

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Monitoring atmospheric composition, especially oxygen levels, is essential in a re-entry scenario because it directly affects crew safety and life support. If oxygen is too low, crew can experience hypoxia quickly, leading to dizziness, impaired judgment, and possible loss of consciousness. If oxygen is too high, the risk of oxygen toxicity increases and the environment becomes more prone to fires, which is especially dangerous in a confined craft. Keeping oxygen within safe limits allows the life-support system to maintain a breathable environment and helps prevent fire hazards. The other options pertain to structural, procedural, or post-incident concerns, not the immediate atmospheric conditions inside or around the vehicle.