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Condensed from an article by By Claudia Fisher/Travel+Leisure

Despite being inside, sitting on an airplane leaves you more exposed to the sun’s harmful rays than you may realize.

“Although plane windows can block UVB rays, UVA rays can still pass through and given the elevated level, the UV rays don’t have to travel as far to cause damage and can be much more intense at higher altitudes,” says Dr. Marisa Garshick, NYC-based dermatologist and assistant clinical professor of dermatology at Weill Cornell Medical College.

While flying, Dr. Garshick says, “It is important to protect from UVA rays in addition to UVB as UVA rays can lead to skin aging as well as skin cancer.”

She recommends “finding a sunscreen that is broad spectrum, which provides coverage for both UVA and UVB, and at least SPF 30. The sunscreen should be applied approximately 30 minutes before flight and you should remember to reapply every two hours, especially if you are traveling on a long flight.” Read more

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