Smart dust

How smart can a city be? Could it tell you where to park your car? Could it guide your car to a vacant space by communicating with your sat-nav system? And is it smart enough to inform you of how many eco-brownie points you have earned by following its advice? All these things are feasible in a smart city model, but for these technological metabolisms to work they need some sort of tiny endpoint monitoring device, probably MEMS (microelectromechanical systems) based, that will feed back the basic information about what is happening on the ground ?? or in the air - ´eyes´, ´ears´, and ´noses´, in effect, that will feed back the basic information.