At high altitudes ythe atmosphere is thinner and more harmful rays reach us.
For every 30 metres increase in altitude the sun's rays are roughly 5% more powerful.
sunscreens are categorised by a Sun Protection Factor or SPF. The higher the SPF, the greater the protection.
As a guide, if your skin usually burns after 15mins in the sun, an SPF of 20 will extend that 15 minutes by 20.
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