Seven students from Vič high school, Ljubljana, Slovenia, demonstrated their skills at the international high school competition Genius Olympiad 2015 in Oswego/NY, USA, ranking the school second best in the world. Two pupils participating in CITI-SENSE activities in Ljubljana had developed a mobile application for displaying air pollution in cities. After returning home with a silver medal, they now are eager to develop the application further. We congratulate the silver medal team and are looking forward to seeing their innovative solutions!