© 2019 IEEE. The recent advancements in information and communication technologies are tackling problems in cities that do strive for urbanization; from economy and transportation, to sustainable and luxury life style. The concept of smart cities is being widespread and several suggested sensing paradigms are currently adopted. Participatory sensing applications offer plenty advantages over the traditional networking sensors, however; its applicability is highly dependent on the voluntary participation of its owners which can be strictly bounded by security challenges. This paper highlights the security concerns in the context of urban sensing scheme and their direct implications on the embracement of such a paradigm. Moreover, it surveys suggested countermeasures to overcome the possible exposure of user's private information. The research's findings formulate the required knowledge upon which more robust and rigid urban sensing scheme can be visualized.