What occurs when the oxygen level of the atmosphere drops below 17 percent?

When the oxygen level of the atmosphere drops below 17 percent, it can lead to hypoxia, a condition where the body does not receive enough oxygen to function properly. Symptoms may include shortness of breath, confusion, and impaired cognitive function. Prolonged exposure to such low oxygen levels can result in unconsciousness or even death, as vital organs begin to fail due to insufficient oxygen supply. Normal atmospheric oxygen levels are around 21 percent, and any significant drop can pose serious health risks.