Heat waves and urban areas

In dense urban areas there is often a lack of ventilation and vegetation.In these dense urban areas in summer during heatwaves,the heat drags on.
                                     Concrete,glass and steel  heat up fast during the day and don't cool down at night.High-rise living  often turns into a health threat during heat waves for those who don't have air conditioning.
                                      More greenery and white roofs can help reduce heat buildup in urban areas.
                                      Shade,water and a cool shower can help cool our bodies down during a heat wave.Hydration and shade really help during a heat wave.
                                      Many people stroll the beach during a heat wave;sticky,sweltering heat  can be overwhelming,especially for the elderly.
                                     During extreme heat  we sweat in order to cool down the body.When it's really humid,evaporation is inefficient.If it is too hot and humid at night,our sweat does not evaporate as we lie there in bed and our bodies build up heat.
                                       During very hot weather periods,our bodies usually rely on cooler nighttime temperatures to cool down.