http://iot.ee.surrey.ac.uk:8080/datasets.html

Open Data Institute - node Trento There you can find mobile data, social data, news , traffic, weather, even electricity consumption all geo-located data.

The Smart City concept is a container for many other "Smart things" from utilities to traffic to environmental to social data, functions and services. So, there might be no such data are available. Some cities are already "smarter" than others without bragging too much about it or labeling themselves as such, e.g. in the UK there are many enlightened cities and local authorities that publish data about many of those dimensions and empower their own government or third parties to take action from it.

this paper might help you:

Smart city: The state of the art, datasets, and evaluation platforms

https://www.kaggle.com/datasets