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To help protect our skin from invisible ultraviolet (UV) rays from the sun, namely UVA and UVB rays. UVC rays are short wavelength and do not reach the earth's surface.
UVB 5-10%
UVB rays make up about 5-10% of the rays that reach us:
Affects the skin's outer layer
Are the primary cause of sunburns, skin cancer, premature skin aging, and tanning.
UVA 90-95%
UVA rays constitute approximately 90-95% of the rays that reach the Earth:
Are weaker than UVB rays, but penetrate more deeply into the skin's layers.
Can contribute to signs of premature aging, such as wrinkles, as well as skin cancer and tanning.
UNDERSTANDING THE UV INDEX
The daily UV index forecast is a prediction of the maximum UV strength for the day, which is usually reached in the early afternoon.
