KVALITET VAZDUHA U REPUBLICI S is a free weather app developed by Predrag Katanić for Android devices. This app is part of the "Establishment of an integrated environmental monitoring system for air and water quality" project, which aims to collect, update and process results from automatic monitoring of air quality in the national and EU network. The app provides real-time air quality monitoring results from state and local networks in Vojvodina, Pančevo, and Belgrade. The project is implemented as a distributed system with a central server in the Environmental Protection Agency and appropriate links with existing local networks in Novi Sad, Pančevo, and Belgrade.

The app is designed to provide information to the public about air quality in Serbia, which is regulated by existing domestic regulations, including the Air Protection Act and sub-law acts such as the Conditions for Monitoring and Air Quality Requirements Regulation. The app is useful for people who are concerned about air quality and want to stay informed of the latest data. However, it is important to note that this app is not designed to provide health advice.