According to a warning from the National Center for Hydrology Meteorology Forecasting, the ultraviolet (UV) index in the localities from Thua Thien - Hue to Ca Mau Province will reach extreme harmful level, ranging from 9 to 11 in the next three days.

Many cities in the Southern region will suffer from extreme harmful ultraviolet (UV) radiation in a range of red- color zone in the next three days, according to the National Center for Hydro-meteorology Forecasting. 

According to the National Center for Hydro-meteoorlogy Forecasting, ultraviolet (UV) index in the Southern region has been in a range of orange or red-color zone with a high harmful risk to human health under the sun-exposure.