ILO (14.12.2016) Currently, 4 billion people live in the tropical and sub-tropical belt regions that will suffer most from extreme heat. In particular, workers in sectors such as agriculture, construction, mining and oil refining are most vulnerable. Indeed, workers most affected are those who need to work continuously at high physical intensity, in manufacturing factories without cooling system facilities and migrants exposed to poor and informal working conditions. Besides, the effects of rising heat will be more severe in urban areas compared to rural areas due to the “urban heat island effect”.