What is the difference between UVA and UVB rays?

UVA and UVB come from the sun and penetrate the atmosphere of the earth. Although both types are responsible for different health risks, they're equally harmful to your skin.

UVA

UVA rays are less intense than UVB rays, however they are 30 to 50 times more prevalent and they penetrate the skin deeper than UVB rays. They are present with relatively equal intensity during all daylight hours throughout the year, and can penetrate clouds and glass. These rays play a major part in premature ageing of the skin.

UVB

UVB rays affect the superficial epidermal layers of the skin. They are the chief cause of skin reddening and sunburn. The intensity of UVB rays varies depending on the season, location, and time of day.

More questions

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Should I apply sunscreen or moisturiser first?

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There are so many different sun protection products around, what should I look for?

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What sun care advice do you recommend for pale Irish skin?

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What is the difference between UVA and UVB rays?

UVA and UVB come from the sun and penetrate the atmosphere of the earth. Although both types are responsible for different health risks, they're equally harmful to your skin. UVA UVA rays are less intense...

Can I use leftover sun cream from last year?

According to the experts, Sun cream has a shelf life of two – three years from its manufactured date. However, this is assuming that the bottle has been unopened and stored in a cool, dry place. As we...

Should I always wear SPF?

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Does suncream expire?

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