1. The mask uses observation data provided by Korea Environment Corporation (Air Korea) and may differ from the actual figures.

2. The mask displays (second) fine dust status based on the World Health Organization (WHO) guidelines.

3. You can see the range of observations and conditions (good, bad, etc.) together, so that you can determine the outside air condition more accurately.

4. If you plan to go out tomorrow, see hourly forecasts in the 'Tomorrow forecast' menu.

5. You can search and check the waiting status of other areas as well as the (second) fine dust status of your location.

6. Take care of yourself and your family through a mask.