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. 
The most common acute harm to UV ears is sunburn from short-term overexposure, doctors say. In particular, when the peak heat is hot it can cause heatstroke or heatstroke, affecting health. Accumulated UV exposure, or frequent and prolonged exposure to high UV rays, can lead to premature skin aging, especially skin cancer. The time of day that UV rays most easily affect the skin range from 10 to 16 hours depending on the season and region. So, to determine the dangerous UV index by standing in the sun and observing your shadow, if the shade is shorter than the height, it corresponds to the high UV index, now should use sun protection measures. . What to do to limit ultraviolet rays? At this time of prolonged hot weather, BS. Diep recommends that people take proactive measures to protect their bodies from UV damage such as: limiting peak sun exposure (shadow observation rule). When going out in the sun, you need to ensure sun protection measures: use sunscreen (choose a broad spectrum sunscreen that is resistant to UVB (SPF), UVA (PA), (SPF) rays. 30 and above, PA +++) Sunscreen should be reapplied every 2 hours or after exposure to water to ensure skin protection. You can use a combined sunscreen to protect your skin, UV-protective eyeglasses, wear a hat, and sun-protective clothing. Besides, drink enough water, eat fresh fruits and vegetables. In addition to filtered water, you can add mineral water, vitamin-rich fruit juice …
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