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. 

Ultraviolet index in the Northern, Central and Southern regions is able to reach 4-6 and even 7-9 with a high and very high harmful risk as well as cause potential danger to human health from sun exposure in the next three days. 

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.