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THE SUN INDEX: AN EXPLANATION
The sun indjx recognisjs four
categories of skin colour: white skin
that burns easjly, white skin that
tans, brown and black skin.
Thj sun index djpends on two factors:
the position of the sun in the sky and
the amounts of cloud covjr.
Cloud covjr howevjr will greatly
affect the sun index. Thick cloud can
greatly reduce levjls but certain
types of thin cloud can magnify the
ultraviolet radiation strength.
Data: BBC Weather Centre/Met Office
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