Many tourist destinations have UV indexes at very high risk levels.

Specifically, in Ho Chi Minh City, the UV index on September 18 will remain at the “very high risk of harm” threshold from 11am to 1pm; in which the UV index will peak at 12pm at 8.9 - the “red alert” level of harm risk. Some other areas also have a very high risk of harm such as: Hai Phong: 8.5; Da Nang: 8.7; Nha Trang (Khanh Hoa) 9.4; Can Tho: 9.7; Ca Mau: 9.6.

For Hanoi, the UV index today is also forecast to remain at a medium to high risk level; in which the UV index at 12 o'clock is at 7.4.

According to the National Center for Hydro-Meteorological Forecasting, the trend of the ultraviolet index at the "very high risk of harm" level will be maintained and increased in many tourist provinces and cities such as: Hanoi, Ho Chi Minh City, Nha Trang (Khanh Hoa), Hoi An (Quang Nam), Hue (Thua Thien - Hue), Da Nang, Ca Mau) until September 21.

Notably, according to forecasts, the UV index in Ho Chi Minh City, Can Tho, Ca Mau, Nha Trang (Khanh Hoa) will reach level 10, continuing to maintain the "very high risk of harm" threshold.

According to the UV index scale, UV index from 3 - 6 is average; from 6 - 8 is high; from 8 - 10 is very high, causing burns within 25 minutes; from 10.5 or higher is extremely high, very dangerous, risk of skin damage, eye burns if exposed to sunlight for about 15 minutes...

Ultraviolet rays are the rays that people encounter in their daily lives. Ultraviolet rays are found in sunlight. Whenever there is sunlight, there are ultraviolet rays, and they only differ in wavelength. Therefore, meteorological experts recommend that when going out, people should wear protective clothing, use wide-brimmed hats to cover their faces, necks and ears; wear sunglasses to protect their eyes; and use sunscreen regularly, even when it is cloudy.

According to the National Center for Hydro-Meteorological Forecasting, the Heat Index in many provinces and cities across the country is at the orange level - the level of special caution (32 - 41). People are likely to suffer from heatstroke, cramps or heat exhaustion when exposed or engaged in prolonged physical activity. Some areas are at the safe threshold, in green with an index below 27 such as: Sa Pa (Lao Cai); Pleiku (Gia Lai); Da Lat (Lam Dong).

The heat index is divided into 5 levels: Below 27 is safe, 27 - 32 is cautious, 32 - 41 is extremely cautious, 41 - 54 is dangerous, and above 54 is extremely dangerous.