";s:4:"text";s:5096:" You should also avoid being out in the sun during the middle of the day.Sunglasses are also important. Bright surfaces, such as sand, water, and snow, will increase UV exposure. Generously apply broad spectrum SPF 30+ sunscreen every 1.5 hours, even on cloudy days, and after swimming or sweating. "And don't be caught out on cloudy days. VideoHuw Edwards: My grandfather, Prisoner of War. The ultraviolet (UV) index is a scale that represents the intensity of UV radiation produced by the sun. If you burn easily, cover up and use broad spectrum Stay in shade near midday when the Sun is strongest. "You should regularly apply a high factor sunscreen to prevent skin damage - especially if you are fair-skinned. Generously apply broad spectrum SPF 30+ sunscreen every 1.5 hours, even on cloudy days, and after swimming or sweating. "Normally they're about six or seven in the summer months," says BBC Weather's Matt Taylor. The BBC is not responsible for the content of external sites.The UV Index (or UVI) is a standard international measure of ultraviolet radiation emitted by the Sun - which penetrates the Earth's atmosphere and can cause sunburn. Altitude: Because air at higher altitudes is thinner, UV radiation goes up as you "go up" in altitude. "We've just passed the summer solstice so the sun is particularly high in the sky," says Taylor. For example, if a light-skinned individual (without The purpose of the UV index is to help people effectively protect themselves from UV radiation, which has health benefits in moderation but in excess causes sunburn, While the UV index can be calculated from a direct measurement of the UV spectral power at a given location, as some inexpensive portable devices are able to approximate, the value given in weather reports is usually a prediction based on a computer model. VideoRolls-Royce launches £250,000 car as demand reboundsThe Nigerian drummer who set the beat for US civil rightsIsraelis and Emiratis meet online after peace deal. The UV index is designed as an open-ended linear scale, directly proportional to the intensity of UV radiation that causes sunburn on human skin. The Sun Index forecast refers to the daily maximum. Highest readings occur in the four-hour period around solar noon, which - depending on where you are and whether daylight saving time is applied - is between 12:00 and 14:00. (Solar noon generally does not correspond to the clock time of 12:00 noon.) Although this may be in error (especially when cloud conditions are unexpectedly heavy or light), it is usually within ±1 UV index unit as that which would be measured.When the UV index is presented on a daily basis, it represents UV intensity around the sun's highest point in the day, called Because the index scale is linear (and not logarithmic, as is often the case when measuring things such as brightness or sound level), it is reasonableThe UV index is a number linearly related to the intensity of sunburn-producing UV radiation at a given point on the To illustrate the spectrum weighting principle, the incident power density in midday summer sunlight is typically 0.6 mW/(nm mAfter sporadic attempts by various meteorologists to define a "sunburn index", and amid growing concern about ozone depletion, Environment Canada scientists James B. Kerr, C. Thomas McElroy, and David I. Wardle invented the modern UV index in Toronto, Ontario. Bright surfaces, such as sand, water, and snow, will increase UV exposure. The UV Index scale used in the United States conforms with international guidelines for UVI reporting established by the World Health Organization Exit Learn how to read the UV index Scale to help you avoid harmful exposure to UV radiation. Measurement of strength of sunburn-producing ultraviolet (UV) radiation Minimize sun exposure between 10 a.m. and 4 p.m. Environment Canada launched it as part of the weather forecast on May 27, 1992, making On December 29, 2003, a world-record ground-level UV index of 43.3 was detected at Bolivia's In 2007, the United Nations honored UV index inventors Kerr, McElroy and Wardle with the Innovators Award for their far-reaching work on reducing public health risks from UV radiation.When the day's predicted UV index is within various numerical ranges, the recommendations for protection are as follows:Wear sunglasses on bright days. Try to avoid sun exposure between 10 a.m. and 4 p.m.
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