“Transport and Air Pollution” meetings have been held since 1986 in Graz (Austria), Avignon, Reims and Toulouse (France) and Boulder (Colorado, USA). This 18th symposium will take place in Switzerland, near by Zürich. The aim of the symposium will be to bring together scientists, users and policy makers to assess the current scientific knowledge of air pollution due to emissions from transportation systems. This conference will consider all relevant aspects of the impact of transport on the environment and on air pollution considering both local and global aspects.