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World Meteorological Organization-Official City Weather Forecasts |
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Erythemal action spectrum : The response of skin to ultraviolet radiation of different wavelengths. (Click here to look at the spectrum curve) Infrared Radiation : The wavelengths of infrared radiation are longer than those of visible light and range between 700 and 1,000,000 nanometers (nm) [1nm = 10-9m]. Intensity : The amount of radiation energy fell on unit area per unit time. Ozone layer : The layer of the atmosphere in which the concentration of ozone is greatest. Typically, the ozone layer lies between altitudes of 20 to 25 kilometre. Photochemical smog : Smog produced by action of solar radiation, especially of ultraviolet radiation, on exhausts from vehicles and industry. Photochemical smog irritates the eyes, nose and throat and damages plants. As smog increases, it can trigger more serious health problems e.g. asthma, bronchitis, increased susceptibility to respiratory infections and decreased lung function. Radiation : The transmission of energy by electromagnetic waves or particles. Spectrophotometer : An instrument for measuring the intensity of radiation as a function of wavelength. Sun Protection Factor (SPF) :
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