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What Is the Difference Between UVA and UVB?

April 26, 2017UVa UVB

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What Is the Difference Between UVA and UVB?

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Sunlight consists of two types of harmful rays–UVA rays and UVB rays. The UVB rays are the sun’s burning rays (which are blocked by window glass) and are the primary cause of sunburn and skin cancer. UVA rays (which pass through window glass) penetrate deeper into the base layer of the skin. They also contribute to skin burning and skin cancer. Both UVA and UVB rays can suppress the immune system that helps to protect you against the development and spread of skin cancer.