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The Science

Why Altitude Changes Everything

+30%

More UV At 3,000 M

UV radiation rises by about 10% for every 1,000 m you climb. At 3,000 m your skin takes roughly 30% more UV than at the beach.

−20°C

Colder, Drier Air

Air cools by about 6.5°C per 1,000 m, so 3,000 m is around 20°C colder than the coast. Cold air holds less water and dries skin faster.

UV 11+

Extreme UV Near The Equator

Indonesia sits on the equator, where the midday UV Index often reaches 11 or more. The WHO rates that level as extreme.

Sources: WHO, Global Solar UV Index (UV and altitude, UV Index scale). International Standard Atmosphere (temperature and altitude).