For the most vulnerable communities—those in low-income areas, often in dense urban areas that create oppressive “heat islands”—the hottest days can become lethal. In fact, over the last 30 years, exposure to heat has been the deadliest of all weather phenomena. And according to Boston University research, the death toll may be even higher than official records indicate. 

Heat Exposure Hits Some Neighborhoods Harder Than Others | The Brink | Boston University