Specifically, from 11am to 1pm on July 29, the UV index in cities at a very high risk level included: Ha Long (Quang Ninh) 8.0; Hai Phong 9.0; Hanoi 8.5; Hue (Thua Thien - Hue) 7.9; Da Nang 8.0; Hoi An ( Quang Nam ) 9.4; Nha Trang (Khanh Hoa) 8.2; Ho Chi Minh City 8.0; Ca Mau City (Ca Mau) 9.2.
It is forecasted that from July 30 to August 1, the highest UV index will remain at a high risk threshold. In some cities such as Hue (Thua Thien - Hue), Da Nang , Hoi An (Quang Nam), on July 30-31, this index will tend to be higher and at a very high risk threshold (9-10).
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 directly for 25 minutes continuously. 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.
On July 29, the maximum heat index (HI) in Hanoi , Quang Ninh and Ha Tinh provinces was at 41-54, a dangerous level. At this index level, people are at risk of heatstroke and heat exhaustion; heat stroke can occur if exposed or physically active for a long time in hot weather.
In addition, Da Nang City, Hoang Sa (Da Nang), Quy Nhon (Binh Dinh), Ho Chi Minh City, Truong Sa (Khanh Hoa) have maximum heat indexes of 32-41, which are at the special caution level. At this temperature level, people are likely to suffer from cramps or heat exhaustion when exposed to hot weather or prolonged physical activity.
The heat index is an index that combines the temperature and relative humidity of air in shaded areas to assign an equivalent temperature as perceived by humans.
A maximum heat index below 27 is safe; 27-32 is at the caution level, which can cause fatigue if exposed to heat or prolonged physical activity; 32-41 is at the special caution level, which can cause cramps or heat exhaustion when exposed to heat outdoors or prolonged physical activity. A maximum heat index of 41-54 is dangerous, people are likely to get heatstroke, heat exhaustion, and even heat stroke if exposed to heat or prolonged physical activity. A maximum heat index above 54 is extremely dangerous, people are very susceptible to heatstroke and heat stroke outdoors.
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.
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