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12
votes
2answers
911 views

How harmful is the rising/setting sun?

Often, while hiking, my companions and I treat the very early/late sun as being less harmful (as far as skin cancer and UV radiation are concerned). For example, we might not apply sunscreen ...
8
votes
1answer
97 views

Is there simple guidance on sunburn risk associated with altitude?

When skiing, if the weather is good, I often come back with a better tan than if I have been at the beach. Obviously with altitude, there is less blocking of UV rays by the atmosphere. But how much ...