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Ultraviolet (UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun.
May 31, 2024 · Ultraviolet radiation is a form of electromagnetic energy that lies between visible light and X-rays. It has various applications, such as producing vitamin D, sterilizing materials, and fluorescing substances, but it can also cause skin damage and cancer.
- The Editors of Encyclopaedia Britannica
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Mar 9, 2016 · Learn about the types, sources, effects and protection of UV radiation from the World Health Organization. Find out how ozone depletion, season, time, altitude, clouds and reflection affect your UV exposure and risk of skin cancer.
- Ozone is a particularly effective absorber of UV radiation. As the ozone layer gets thinner, the protective filter activity of the atmosphere is pr...
- The three types of UV radiation are classified according to their wavelength. They differ in their biological activity and the extent to which they...
- Time of year and time of day UV levels vary mainly with the height of the sun in the sky and in mid-latitudes are highest during the summer months...
- Overview
- Health Effects
- People at Particular Risk
- Protective Measures
- Who Response
Ultraviolet radiation (UVR) can neither be seen nor felt. While some people are exposed to artificial UVR sources (e.g. in medicine, industry and for disinfection and cosmetic purposes), everyone is exposed to solar UVR. Solar UVR levels are influenced by several factors: 1. Sun elevation: the higher the sun in the sky, the higher the UVR level. UV...
Small amounts of UVR are beneficial to health and play an essential role in the production of vitamin D. However, excessive exposure to UVR is associated with negative health consequences as UVR is carcinogenic to humans.
Children and adolescents are particularly vulnerable to the harmful effects of UVR due to their skin and eye structure. Sunburns in childhood lead to a higher risk of skin cancer in later life. Also, a larger amount of UVR can reach and damage their retina. Fair-skinned people suffer more from sunburn and have a higher risk of skin cancer than dark...
Skin cancer is highly preventable. WHO recommends the following measures to protect against excessive exposure to UVR. 1. Limit time in the midday sun. 2. Seek shade. 3. Wear protective clothing. 4. Wear a broad brimmed hat to protect the eyes, face, ears and neck. 5. Wear wraparound-style sunglasses that provide 99 to 100% UV-A and UV-B protection...
WHO aims to reduce the burden of disease resulting from exposure to UVR. It encourages research, develops guidance and disseminates information tools about effective UVR protection interventions related to the public, occupationally exposed workers and patients. The Global Solar UV index (UVI), an information tool that describes the level of solar ...
Ultraviolet radiation from the sun is the primary cause of skin cancer, but UV light from tanning beds is just as harmful. Exposure to sunlight during the winter months puts you at the same risk of exposure during the summertime.
Aug 10, 2016 · Learn about ultraviolet (UV) light, its sources, effects, and applications in astronomy and Earth science. See images and videos of UV waves from the Sun, stars, galaxies, and aurorae.
