Breakthroughs in Sun Protection: Understanding UVB

by Marie Veronique

UV exposure is responsible for 90% of human nonmelanoma skin cancer. Of the UV light reaching the earth, 90% of the waves are UVA lengths (320-400 nm) and only 10% are the shorter UVB wavelengths (280-320 nm). Both UVA and UVB are studied for their skin cancer-causing potential, however focus has been on UVB. This is at least partially because UVB is considered a  complete carcinogen—a substance able to initiate, promote and progress the development of skin cancer.

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