International Transport and Air Pollution Conferences have been held since 1986 in Graz (Austria), Zurich (Switzerland), Avignon, Reims, Toulouse and Lyon (France), Boulder (Colorado, USA) and Thessaloniki (Greece). After the 2016 conference in Lyon, this 22nd TAP conference will take place in Zurich (Switzerland) again. The aim of the symposium is to bring together scientists, international experts, users and policy makers to share and assess the current scientific knowledge of air pollution due to emissions from transport systems.