really heats up about 10:00, 10:30. reporter: so you have to plan your day around the heat i do. reporter: she s now one of 100 volunteers. this reads the temperature and you watch the temperature app on your phone. reporter: working on a project called urban heat atl volunteers using special technology to map atlanta s temperature, block by block. reporter: what type of neighborhood are we in right now. we are in a predominantly black neighborhood reporter: how hot is it here it s about 92 degrees fahrenheit reporter: the goal to prove some neighborhoods are hotter than others. new research shows that more than 70% of u.s. counties, low-income non-white neighborhoods experience more extreme surface heat than their wealthier, whiter counterparts the reason urban heat island unshaded asphalt areas that amplify heat. we see that black and brown neighborhoods are simply hotter or feel hotter than white ones why is that? yeah. the lack of green space, lack of parks,
and just doubled the capacity here. how do things look on your end? -perfect! because we re building a better network every single day. there is a state of emergency tonight on the spanish resort island of la palma where a volcano has erupted for the first time in 50 years. thousands forced to evacuate as the lava destroyed about 100 homes. though there have been no reports of injuries or deaths. after the hottest summer in the u.s. on record, the biden administration unveiled a new effort to protect americans from a silent killer, extreme heat and it can be especially dangerous in neighborhoods that have become known as urban heat islands. morgan radford explains in our series climate challenge. from the moment her day begins describe the heat. what does it feel like well, i wipe the sweat off. i m melting. reporter: annie moore has to fight the heat. get out about 7:00 before it