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UVA (ultraviolet-A): long- wave solar rays of 320-400 nanometers (billionths of a meter). Although less likely than UVB to cause sunburn, UVA penetrates the skin more deeply, and is considered the chief culprit behind wrinkling, leathering, and other aspects of 'photoaging.' The latest studies show that UVA not only increases UVB 's cancer-causing effects, but may directly cause some skin cancers, including melanomas.
UVB (ultraviolet-B): short-wave solar rays of 290-320 nanometers. More potent than UVA in producing sunburn, these rays are considered the main cause of basal and squamous cell carcinomas as well as a significant cause of melanoma.
http://jaxmed.com/articles/wellness/spf.htm
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UVA rays are much worse than UVB
Answer this Question: "Whats the differnce in UVA rays and UVB rays?"
Whats the differnce in uva rays and uvb rays?
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whats the differnce in UVA rays and UVB rays? I saw something on tv the other day where some sunscreen protects from both kinds. I didnt even know there were 2 diff. kinds!