Many localities have UV index at very high risk level.

On August 26, this area continues to have hot weather, some places have severe heat with the highest temperature of the day commonly from 36 - 38 degrees Celsius, some places over 38 degrees Celsius.

Due to the hot weather, many cities in the Central region have very high UV index thresholds. Especially in Da Nang, Hoi An, Nha Trang, the UV index reaches approximately 10 - a very high risk level. The time when the UV index is at its peak usually occurs from 10am to 1pm.

From August 26 to 28, the UV index in Hanoi was 7; 9; 6, respectively; Hai Phong was 9; 9; 7; Ha Long City (Quang Ninh) was 9; 9; 6; Hue City (Thua Thien - Hue) was 8; 9; 8; Da Nang City was 9; 8; 9; Hoi An City (Quang Nam) was 10; 7; 9; Nha Trang City (Khanh Hoa) was 10; 9; 7; Ho Chi Minh City was 9; 9; 10; Can Tho City was 9; 10; 10; Ca Mau City (Ca Mau) was 10; 10; 10.

The UV index scale states that 2.5 - 5.4 is average, 5.5 - 7.4 is high, and 7.5 - 10.4 is very high. At very high levels, UV rays can cause skin burns if exposed to direct sunlight continuously for 25 minutes. An index of 10.5 or higher is extremely high, very dangerous, causing the risk of skin damage and eye burns if exposed to sunlight for about 15 minutes without protection.

Due to the effects of heat and intense heat combined with low humidity, there is a risk of explosions and fires in residential areas due to increased demand for electricity. The risk of forest fires is also high. Heat can also cause dehydration, exhaustion, and heat stroke in the human body when exposed to high temperatures for a long time.

To prevent the harmful effects of ultraviolet rays and heat shock, people working outdoors need to wear sun protection equipment such as protective clothing, hats, glasses, etc.; always ensure enough water for the body.