Air pollution is one of the main threats to humans' health. In Italy, despite the majority of air pollutants are experiencing a descending trend, Particulate Matter (PM) particles are the main cause of air pollution. This thesis work contributes to the development of a smart system capable of gathering and elaborating PM10 and PM2.5 air pollution data: in particular, while measurements are being taken by tiny and portable monitoring devices and stored locally in each device, citizens’ smartphones should act as a bridge towards the Internet for the monitoring devices so that information about air pollution can be sent to a remote server, which will collect data, perform calibration and provide REST APIs to be queried for accessing information.