The difference is mainly in their wavelength. UVB rays are more harmful in summer months, when the Earth is closer to the sun, than the winter months. It’s harder for these rays to reach Earth’s surface when the planet moves away from the sun. UVB only penetrates the epidermis.
UVA rays are harmful year round, no matter how far or close the Earth is to the sun. These rays are considered X rays and can penetrate light clothing, glass, windshields, etc. UVA rays can penetrate through the epidermis and disperse in the second layer of skin. Contrary to some belief UVA rays are much more damaging to the body than UVB.
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