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One of the most significant health issues we face today on a global scale (mainly in large cities) is the issue of air pollution. Numerous companies, research centers, and universities have undertaken research and implemented projects aimed at monitoring, studying, predicting, and improving air quality. The primary purpose of this M.Sc. thesis is to develop an application for monitoring air quality. First and foremost, this work presents the phenomenon of atmospheric air pollution and the impacts it has on the health of citizens. Subsequently, a large number of mobile applications for monitoring the quality of atmospheric conditions in real-time are introduced. These applications provide a collection of tools, data, and related notifications, aiming to inform and significantly raise the awareness of their users. These specific applications were selected after researching numerous applications available on the internet and were tested on Android and IOS smartphones to derive coherent, logical conclusions. The most important conclusion from this analysis is that no application supports many functions (usually, a subset of available features is implemented). Finally, an analysis of the relevant technologies and issues related to air quality is conducted. The application developed as part of this master's thesis, besides monitoring air quality by area, also offers the capability to send notifications by area. The application besides monitoring air quality by region has the ability of region-byregion air quality alerts. For the development of this application, technologies were used both on the front-end and the backend with JavaScript. More specifically, for the front-end part, we used the Ionic framework with React, and for the backend, NodeJS. The application's infrastructure is serverless with Lambda functions and Amazon Web Services (AWS).