harriet bradshaw has this exclusive report.temperatures, some city buildings already get hotter compared to others in green spaces. a big problem if you have health issues made worse in the heat. alison has asthma. the whole house would be like an absolute tavern. the fans are going. my inhaler tries to help but then it got so bad i couldn't breathe at all and my partner had to take me to hospital. to keep neighbourhoods cooler, experts recommend more green space are needed. so during the heatwave lastjuly, a satellite measured the land surface temperature of this block of flats here as 27 celsius but what's really interesting is just across the road beyond this wall, the cemetery, green space measured at 2! celsius. now that's a six celsius difference. and although land surface temperature isn't a perfect measurement, experts say this temperature difference is a strong indicator of the urban heat island effect. what is that? simply put, the materials of exposed built—up areas absorb heat creating hotspots compared to less buil