The involvement of the public in research has significant potential, especially through the provision of massive amounts of data. This is commonly known as citizen science. In the recently started European Horizon 2020 research project CompAir, we will exploit citizen science data about air pollution. Augmented Reality is the appropriate technology to make these data accessible to a large variety of users in their local surroundings. Following ideas from Noble & Sridar, we will further research and develop new ways to visualize complex environmental data in a meaningful way. The user will be able to receive local environmental information from plenty of sensors augmented in its smart phone. This will help change daily behavior, but also provide valuable data sources for environmental policy making in urban environments. The challenge will be to transform complex statistical data into a meaningful visualization that attracts and engages people.