Will the effects of the sun be stronger on the mountain?
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Absolutely, so precautions are required. About 55% of the earth’s protective atmosphere is below an altitude of 5000m. Far less ultraviolet light is being filtered out, making the sun’s rays much more powerful, which could result in severe sun burning of the skin.
It is strongly recommended to use a 20+ sun protection cream at lower altitudes, and a total block cream above an altitude of 3000m.
It is also important to wear dark sun glasses preferably with side panels above 4000m in daytime and essential when walking through snow or ice. Snow blindness can be very painful, and will require your eyes to be bandaged for at least 24 hours.