Which two physical factors are most closely linked to altitude illness risk?

Which two physical factors are most closely linked to altitude illness risk?

• A. Altitude and Rate of Ascent
• B. Temperature and Humidity
• C. Time of Day and Wind
• D. Latitude and Solar Exposure

Answer: (A)

Altitude illness risk depends on how high you go and how quickly you get there. At higher altitudes the air carries less oxygen, so the body has to work harder to maintain adequate oxygen delivery. The faster you ascend, the less time the body has to acclimate to the lower oxygen levels, which raises the chance of developing acute mountain sickness and its more serious forms. So the two physical factors most closely linked to risk are how high you go (altitude) and how fast you climb (rate of ascent). The other factors listed—temperature and humidity, time of day and wind, latitude and solar exposure—affect comfort, dehydration, or exposure but do not drive the physiological threshold for altitude illness in the same way.

Altitude illness risk depends on how high you go and how quickly you get there. At higher altitudes the air carries less oxygen, so the body has to work harder to maintain adequate oxygen delivery. The faster you ascend, the less time the body has to acclimate to the lower oxygen levels, which raises the chance of developing acute mountain sickness and its more serious forms.

So the two physical factors most closely linked to risk are how high you go (altitude) and how fast you climb (rate of ascent). The other factors listed—temperature and humidity, time of day and wind, latitude and solar exposure—affect comfort, dehydration, or exposure but do not drive the physiological threshold for altitude illness in the same way.