According to the National Center for Hydro-Meteorological Forecasting, the UV index common in the last 2 days of the week (June 12-13) in the northern provinces and cities is at very high risk of causing harm.
Particularly, the UV index in Hai Phong and Hanoi on June 13 has an average risk of harm.
In central provinces and cities, this index is common at a high risk of harm, especially on June 12 at an average level. The UV index in the southern provinces and cities has a high and very high risk of harm, except for Ho Chi Minh City and Can Tho on June 12, which has a moderate risk of harm. 
On June 11, the ultraviolet index of provinces and cities in the North was very high. Illustration: Tuan Duc/VNA On June 11, the ultraviolet index of provinces and cities in the North was very high. This index in Ha Long city (Quang Ninh province) is from 8.4 to 9.1, in Hai Phong city it is from 8.9 to 9.2 and the same harm is very high from 11 to 13 hours. UV radiation in Hanoi city is very high at 12 o’clock with the highest index of only 7.8. In the southern and central provinces and cities, the UV index reached high levels. Except for Ho Chi Minh City, UV radiation reaches 8.3 – 8.9 and is harmful at very high levels from 11 to 13 hours. According to the World Health Organization (WHO), the UV index of 8-10 will cause burns to the skin if exposed to the sun for about 25 minutes. This index is 11 or higher, the skin is at risk of burns if exposed to the sun for about 10 minutes without protection. And ultraviolet rays at 12 will be very dangerous to health. Ultraviolet radiation is a component of sunlight, in which ultraviolet A and B rays (UVA and UVB) can damage the DNA of skin cells. When exposed to too much sunlight, the skin will burn, dry, darken, lose elasticity, create wrinkles, accelerate aging and can cause skin cancer. In addition to affecting the skin, UV rays can also cause eye problems. Experts recommend that everyone needs to wear goggles to protect their eyes. When outdoors, people should wear sunglasses that block at least 99% of ultraviolet rays. Sunglasses can help prevent cataracts, as well as wrinkles around the eyes, and it’s best to ask your ophthalmologist for the right glasses. The hot sun brings with it harmful ultraviolet rays that will also be dangerous to the skin. Therefore, besides sun protection measures such as wearing clothes, wearing a wide-brimmed hat… people need to pay attention to apply sunscreen and should apply it every 3 hours to protect the skin.
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