In (the province of) Utrecht in The Netherlands we are running the largest mobile air quality project in Europe called Snifferbike. With 500 mobile sensors on bicycles we measure for one year the air quality and routes. Every 10 seconds the air quality is measured and GPS-routes tracked. We have added our English brochure. September 2018 we did the first pilot with 10 sensor and people cycled 8000 km in 5 weeks. On this visualization your can see how that worked out. Now we start with phase 2 and scaling up to 500 new sensors. This project is run together with the Province of Utrecht, RIVM (National institute for Health and Environment), Sodaq (sensors) en Civity (data).