this app is a good idea, and i haven’t seen any other app like this, but it has a lot of bugs that needs to be fixed, but i can see it being very useful like he said “we take 17,000 breaths a day,” so its important to monitor the quality of air. it looks nice and it is straight forward, you can add cities, zoom in and zoom out etc..
ahmadturkmani about World Air – Weather Smog Particulate pm2.5 pm10 Pollution Information, v3.1