How to be sun savvy and get the right level of protection from UV rays.
Some UV radiation is essential for our wellbeing, and the sun's rays provide warmth and light.We need to control our exposure, says Prof Dorothy Bennett, from St George's, University of London.This is important for the function of bones, blood cells and our immune system.
"Melanoma, the most dangerous skin cancer, is now the fifth commonest cancer in the UK, the ongoing rise being attributed to sunbathing," she said.The highest readings occur in the four-hour period around "solar noon", which is when the sun is at its highest spot in the sky - usually from late morning to early afternoon.Values start at zero and can rise above 10.
Nairobi in Kenya can have UV levels above 10 all year, according to the World Health Organization .But the Falkland Islands in the South Atlantic never usually gets above five in December and January .If you want one, Dr Bav Shergill, of the British Association of Dermatologists, says the safest way to tan is "out of a bottle" - using self-tan.
The amount of UV reaching your skin is not driven by the daily temperature, Dr Michaela Hegglin, from the University of Reading's Department of Meteorology, says.
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