Golfers playing in Vail, Colorado, at 2500 meters (roughly 8200 feet) above sea level, got significantly more burn protection from sunscreen with a sun protection factor (SPF) of 70+ compared to one with an SPF of 15.
There is 8-10 percent increase in sun exposure for every thousand feet of elevation. In the summertime, you can get anywhere from 40 percent to 50 percent greater sun intensity than at sea level.
References:
Sunscreen with high SPF needed at high altitudes, Reuters.
What sunscreen to use for children?
Image source: Amazon, for illustration only, not a suggestion to buy any products.
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Recommendation and review posted by G. Smith
