Air quality index (AQI) widget for Übersicht.
Show AQI data from aqicn.org
Change Hangzhou to your city in command and change en to your language.
from aqicn.org:
Chinese simplifed "cn",
Chinese traditonal "hk",
Japanese "jp",
Korean "kr",
Russia "ru",
Spanish "es",
French "fr" and Polish "pl"
More on my blog in chinese.