A simple plasma widget display city's air quality information in China written in QML.
I suggest you install it directly from Plasma Shell's Get New Hot Stuff tool. But you may still go the old way.
plasmapkg -i aqi_china-VER.plasmoid
plasmapkg -u aqi_china-VER.plasmoid
Notice: VER is the version number.
Air information comes from http://www.PM25.in.
Information are in Chinese because the API returns Chinese data. :-)