People are becoming increasingly concerned about the air quality in China nowadays. This app help you to track real-time PM2.5 index of most of the cities in China.

Helpful tips:

-Tap the plus sign to add cities.
-Tap the menu sign to remove cities.
-Swipe left-to-right to move between locations.

Hope it helps and feel free to give me feedback here http://leancodingnow.com/.
Thanks Yi for helping with the design.