Hybrid applications are becoming increasingly popular due to their ability to be used across multiple platforms with a single development effort, reducing both costs and development time. This paper focuses on the development of a hybrid mobile application using Capacitor, a modern tool for developing mobile applications based on web technologies. The goal of the paper is to provide insight into the capabilities of Capacitor and to demonstrate its application through the development of a specific app for displaying air quality measurements in Croatia. The first part of the paper introduces the Capacitor platform, which allows for the creation of hybrid mobile applications using standard web technologies such as HTML, CSS, and JavaScript. Capacitor is specifically designed to simplify the integration of native device functionalities, providing users with a nearly native experience. The key features of Capacitor are described in detail, including support for multiple platforms, easy integration with popular JavaScript frameworks, and support for native plugins. Additionally, this part of the paper examines Capacitor's competition, including platforms such as Apache Cordova and React Native, analyzing their advantages and disadvantages compared to Capacitor. The second part of the paper focuses on the practical application of Capacitor through the development of a mobile application that displays air quality measurements in Croatia. The process of configuring the development environment is described, including the installation of Capacitor and the necessary dependencies. The development of the application covers the steps from project initialization and platform addition to API integration for collecting air quality data. Special attention is given to the design of the user interface, performance optimization, and application testing. Throughout the development of the application, issues related to user interaction and the display and visualization of air quality data are addressed. The application enables users to monitor air quality in real-time across different regions of Croatia, which is crucial for informing and raising public awareness of environmental issues. In conclusion, the paper highlights the advantages of using Capacitor in hybrid application development, including faster delivery and better resource utilization, and emphasizes the importance of making environmental data accessible through modern technologies.