A new study from WorldPop, based at the University of Southampton, found that factors like income, age and occupation shape who can avoid the worst effects of extreme heat and who cannot. "Heat measures require closer coordination between meteorological and public health services to combine heat warnings with guidance on hydration, cooling and being prepared for rising heatwaves." READ MORE: High river levels could lead to more flooding in Southampton as residents warnedDr Liu said: "Ultimately, one-size-fits-all heatwave planning is ineffective. Andy Tatem, director of WorldPop, said: "We can no longer rely on average city data to plan for heatwaves. "Governments must move toward more realist methods, as highlighted in this study, specifically where the socioeconomic need is greatest."