PM2.5 Air Pollution Forecast Yellow Sand Widget is a free Android application developed by Sinwa Electric Corp. The widget displays air pollution forecasts for fine particulate matter (PM2.5, PM10) and yellow sand based on information provided by SPRINTARS development team. The app also allows users to see 6-hourly forecasts for today and tomorrow, as well as weekly forecasts. The forecasts are categorized into four levels: "Clean," "Slightly Polluted," "Polluted," and "Very Polluted." The app provides options for customization, including background color, transparency, font size, and icon size, among others. Users can also set up alerts to be displayed on the status bar. The app may take up to 2 minutes to update automatically.

Overall, PM2.5 Air Pollution Forecast Yellow Sand Widget is a useful tool for those concerned about air pollution levels in Japan. The app is easy to use, and the forecasts are accurate and reliable. However, the app may not fit perfectly on all devices, and users may need to adjust the font size and widget size for optimal display. It is also worth noting that the app does not provide any contact information for the developer or any way to provide feedback or suggestions.