PM2.5

If you are iPhone and iPad owner,you now can download PM2.5 for free from Apple Store. The application is supporting English language. It is a whopper, weighing in at 16808960, so make sure you have plenty of free space on your iOS device. The new PM2.5 app version 1.0 has been updated on 2016-01-25.
Bottom Line: For more information about PM2.5 check developer Qing Meng Deng`s website : http://blog.sina.com.cn/s/blog_cd86a6a40102xji2.html