CityAir is a smartphone application (App) for the public to express their perception of the outdoor air quality at their location. It allows users to collect and display individual perceptions of air quality, irrespective of where they are in the world. It also allows users to express their view on which source is the main contributor to the poor conditions, if the air quality is not perceived as good.
CityAir gives the user the possibility to rate the air quality in their immediate surrounding by using a code of four colours:
Green – very good air quality;
Yellow – good air quality;
Orange – poor air quality;
Red – very poor air quality.
In CityAir the user can also indicate the assumed source of the air pollution and write a comment