1: air quality detection of the app. 2: can real-time display the current air quality monitoring to the related parameters, such as: pm2.5, pm1, pm10 and so on, the app will save monitoring data by date, convenient user history data comparison, concludes that their own living environment air quality change, in order to make corresponding measures in a timely manner. 3: built in weather forecast, the user can directly to check the local weather. 4: the development team will try to update the app, to give users the best experience. Note: Continued use of GPS running in the background can dramatically decrease 'life.