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Participatory sensing is the process whereby individuals and communities use ever more capable mobile phones and cloud services to collect and analyze systematic data for use in discovery. The convergence of technology and analytical innovation with a citizenry that is increasingly comfortable using mobile phones and online social networking sets the stage for this technology to dramatically impact many aspects of daily lives. Ubiquitous data capture, leveraged data processing, and personal data vault are the essential components for these emerging systems. The architecture, usage models,and application of participatory sensing were discussed in this paper.