Urban computing aims to improve the quality of life of ordinary citizens by providing sustainable solutions. This paper reviewed how Mobile Crowd Sensing can be used for urban computing. The paper listed the features and advantages of mobile crowd sensing mechanism. It highlighted the challenges involved in mobile crowd sensing. The paper also presented a comprehensive study of Apps used to monitor ambient noise data, and compared the ways in which the listed challenges have been tackled in those Apps. The authors proposed a framework for better aggregation analysis of crowdsensed data, which would help in event discovery of urban region.