So, if we are to recognize the entire city to be a living entity, just like a smart human being, a smart city would also require constant monitoring of its health. Just like a human being using a smart band or a smart watch to sense his/her vital parameters such as temperature, blood pressure, glucose, heart rate, lipid profile, Vitamins^([sic]) etc. the smart city may also require several thousand sensors installed in its arteries and touch points to sense its vital organs.
Source: wiktionary