The 22nd International Conference on Modelling, Monitoring and Management of Air Pollution, builds upon the prestigious outcomes of the 21 preceding meetings beginning in Monterrey, Mexico in 1993. These meetings have attracted outstanding contributions from leading researchers from around the world. Their papers are permanently stored in the WIT eLibrary as Transactions of the Wessex Institute (see http://library.witpress.com). These collected conference papers provide an important record of the development of science and policy pertaining to air pollution. Air pollution is one of the most challenging problems facing the international community; it is widespread and growing in importance, and has clear and known impacts on health and the environment. The human need for transport, manufactured goods and services results in impacts on the atmospheric environment from a local to global scale. The rate of development of the global economy brings new pressures and the willingness of governments to regulate air pollution is often balanced by concerns over the economic impact of such regulation. Science is the key to identifying the nature and scale of air pollution impacts and is essential in the formulation of policies for regulatory decision-making. Continuous improvements to our knowledge of the fundamental science of air pollution and its application are necessary if we are to predict, assess and mitigate the air pollution implications to local, regional, national and international systems.