China Air Pollution Index (free)

[Photo/Agencies]

Major Chinese cities can have very bad air pollution so this application helps to arrange your schedule to avoid being exposed to heavy pollution. The app provides up-to-date stats for air pollution in 120 Chinese cities, and can use data from Chinese government sources and the US embassy.

This app will indicate when the pollution is particularly bad so you know when not to go out or when to wear a mask. The app is available for both iOS and Android.