According to the National Center for Meteorological and Hydrological Forecasting, in the next 3 days, the maximum UV index of the central provinces and the South will remain at a very high risk of harm. Meanwhile, the Northern provinces and cities have the maximum UV index at the high risk threshold.
What is ultraviolet rays?
Ultraviolet rays, also known as ultraviolet rays, are rays emitted by the sun whose wavelengths are shorter than visible light and longer than X rays, the wavelengths of UV rays from 10nm to 380nm. Related to human health and based on the UV wavelength are divided into 3 categories: UVA: Wavelength from 380 to 315 nm; UVB: Wavelengths from 315 to 280 nm: UVB rays stimulate the metabolism of Melanin (skin pigmentation), making the skin dark and dull; UVC: Wavelength In addition to the ultraviolet rays emitted by the sun, there are also artificial ultraviolet rays such as those emitted by welding machines, from devices such as computers, phones, and televisions. According to BS. Dang Bich Diep – Stem Cell Research and Application Department, Central Dermatology Hospital said, too much exposure to sunlight will cause sunburns, eye damage such as cataracts, skin aging, If prolonged exposure, accumulation may cause skin cancer. According to BS. Diep, the ultraviolet index or the UV index (ultraviolet rays) is a measure of the intensity of ultraviolet radiation from the sun at a particular place on a particular day. The publication of this index will help people protect against UV rays, as too much exposure to sunlight will cause sunburns, eye damage such as cataracts, skin aging, if prolonged exposure. Long accumulation can cause skin cancer.
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