The standards defined by the human-computer interaction discipline highlight the need for renewed interpretation of services for the customer. Indeed the increasing number of original applications based on the progression of technology and the spread of sensors in almost every space (private and public) is the ground of potential benefits for the end users. Nevertheless every new advance in this scenario should take into account how technology is able to connect and be interfaced with the user natural language. In this regard, the following work proposes an analysis of the feasibility of a smart city public safety application in the context of Covid 19 exposure prevention. Particularly it will be observed how even a necessary service could be enhanced on its effectiveness if designed according to the human-computer-interaction standards.