It provides a visual representation of dust, and also the fine dust, in the air. In reality, that dust is too fine for human eyes to see – but it can cause disease or even death. The app warns users to avoid certain areas or to use masks. It also tells users about the pollution concentration, wind direction, and speed. Users can customize the app by choosing from three animation filters used to represent the dust: real image, shape, or character. They can also take pictures of the visualized dust and share them on social media.