What is UV index?

Many scientists suggest that solar ultraviolet (UV) light waves are harmful to human skin and eye tissue. As a result, the World Health Organization (WHO) has created a UV index, a standard system for measuring the amount of UV light that penetrates the country's atmosphere. The linear scale is one way to measure and monitor the intensity of ultraviolet light and also to warn the public of possible hazards associated with high UV levels. Waves are shorter than visible light. These light waves are often classified as UVA and UVB, usually for the skin and eyes are usually considered more dangerous than visible light. The UV index measures the amount of these potentially harmful waves that achieve a lower atmosphere.

In the area, several factors affecting ultraviolet light affects. First, the position of the sun in the sky is often important. The seasons may affect UV by changing your relationship to Earth is the solar distance and angle of light. UV is also often the strongest inlatitudes closer to the equator. Sunlight is usually the strongest at the moment. Solar noon may not be the same as noon.

Second, atmospheric conditions can also affect ultraviolet levels. The stronger atmosphere results in lower radiation, so the level of UV index often differs from mountain to valley. The cloud cover may also have an effect, but it does not mean a big change, as UV radiation can usually penetrate clouds better than other light wavelengths. In addition, ozone in a high atmosphere can filter harmful UV rays.

Finally, the UV index can play the role of ground reflection. Snow, water and sand can reflect UV light. This reflects can intensify the level of ultraviolet rays that hit individuals outside in these conditions, because they not only get UV directly from the sun, but it reflects back on them from the ground.

There are several ways to limit the exposure of oneUV radiation. Sunglasses with UVA and UVB filters can protect the eyes of a person from damage to the beams. Suning creams at least for sun protection (SPF) 15 are often recommended to protect the skin.

Individuals can also wish to look for shadow, stay inside, or at least avoid direct sunlight during top sunshine. Depending on the time zone, this period usually decreases between 10:00 and 16:00. People may also want to cover their skin by carrying long sleeves, pants and a hat with a wide edge.