This book presents important research advances in the study of air pollution, as well as traffic-related air pollution, the national air quality and the role of ship emissions in air pollution. Topics discussed herein include traffic benzene pollution in Bangkok; organic pollutants in urban air; development of forecasting models for predicting hourly ozone concentrations; traffic-related air pollution; snowmobile pollution in North America; hydrogen-fuelled internal combustion engines; air quality standards; air pollution and greenhouse gas emissions from ships; and emission control area proposals.