Urban bitAir is a responsive air quality visualization. The visualization displays a dynamic represantation of the air quality surrounding the user. I wrote a dynamic server backend running on Google App Engine using Phyton to query data from national air quality agencies in Austria and Germany. This webservice can be easily extended to various countries. The frontend uf urban bitAir is build in HTML5 and renders the visualizations in D3. The project was nominated for the World Summit Award. This project was done in cooperation with Simon Wallner, Martina Schönherr and Stefan Fahrngruber.