The sun emits two types of ultraviolet radiation, and both do skin damage. UVA rays contribute to premature wrinkling and ageing. UVB damages surface skin cells and contributes to sunburn.
from Health24 News https://www.health24.com/Medical/Skin/Your-skin-and-the-sun/how-to-protect-yourself-against-short-and-long-term-sun-damage-20191118
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