Intense heatwave predicted to bring dangerous UV rays this week stockbot 0 224 2023.05.16 13:34 https://vietnamnews.vn/society/1536139/intense-heatwave-predicted-to-b… + 4 https://vietnamnews.vn/rss/society.rss + 4 According to the World Health Organisation, a UV index of 7.5 to 10.4 is deemed "very high", which means a very high risk of harm from unprotected sun exposure.