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Sun Damage: UV Index

UV Index

The UV Index is a next day forecast of the amount of damaging UV radiation expected to reach the earth's surface at the time when the sun is highest in the sky (solar noon).

The amount of UV radiation reaching any area of the earth at any time, is primarily related to the elevation of the sun in the sky, the amount of ozone in the stratosphere, and the amount of clouds present.

The UV Index can range from 0 (night time) to 15 or 16 (in the tropics at high elevations under clear skies). On any place,the UV radiation is greatest when the sun is highest in the sky and decreases as the sun approaches the horizon.

The higher the UV Index, the greater the rate of skin and eye damage. Consequently, the higher the UV Index, the smaller the time it takes before skin damage occurs.

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