The propagation of mobile phones along with their enveloping connectivity has drive the amount of digital data shaped and processed every day. Today many different sensors are by now deployed in the users' mobile phones and soon all their gadgets e.g., even their clothes or cars will implant a massive amount of sensors GPS, digital images, accelerometers, etc. As a result data unruffled by sensor-equipped devices becomes of intense interest to other users and applications. This concept is called Participatory Sensing (PS) sometimes also referred to as opportunistic or urban sensing. It mingles the ubiquity of personal devices with sensing capabilities typical of WSNs.