Fiona O’Brien (MSc&T) at the Transport Research Arena to present a joint research project Fiona O’Brien, a student in the Master of Science & Technology (MSc&T) program “Economics for Smart Cities and Climate Policy” at l’X, and Emma Jung, a student at TUM, submitted their research on the "Impacts of the Paris low-emission zone on mobility and environmental outcomes" to Transport Research Arena (TRA) after having completed this project as part of the course “Cities and Transportation” taught by Professor Zoi Christoforou at École Polytechnique. Fostering connections between science students in Europe To allow qualified students from partner institutions within the European university network EuroTeQ to participate in the course alongside students from École Polytechnique, Professor Zoi Christoforou opened her “Cities and Transportation” course in EuroTeQ’s shared course catalogue. Emma Jung, a master’s student at TUM in Germany, was one of six students from European partner universities who were successfully admitted to the course for the Summer Semester 2025. As part of this course, Fiona O’Brien and Emma Jung studied the impacts of the Paris low-emission zone on mobility and environmental outcomes*, and Professor Zoi Christoforou encouraged them to submit their research project to TRA, where it was selected. The two students presented their research project at the conference in Budapest from May 18-21, 2026, and got the chance to exchange with researchers and professionals from around the world on the topic of low emission zones. Fiona O’Brien’s and Emma Jung’s research compares pre- and post-policy trends between districts inside and outside the Paris low-emission zone to evaluate effects on traffic, metro ridership, bike usage, and air quality. Their findings reveal that the traffic in these zones significantly decreased, but at the same time the air quality worsened citywide. The outcomes suggest the Paris low-emission zone may have displaced congestion