This application lists a list of city with their respective AQI levels. City-wise AQI data is fetched from websocket and pushed into Local Database (RealmDB) and then this data will be fetched from DB to load on Listing screen and Graph screens. *Installation - Clone this Repo <master> branch. - Install pods using `pod install`. - Run the app. *Testcases I have implemented relevant test cases to improve code coverage and fixated UI with data. XCTestCase implementation also tests RealmDB changes. To test the build use 'Command + U' or Run Test build. To further understand the app architecture: https://docs.google.com/document/d/10idy30G4XEym5yg5_vLm8AxfqUzHXbVOJq4BO-0ZcXk/edit?usp=sharing