Many Asian cities are on the threshold of a major environmental crisis resulting from pollution. The deteriorating air quality in cities is a result of rapid economic expansion, population growth, increased industrial output, and the unprecedented growth of passenger vehicles. In Metro Manila, Philippines, the main contributor to air pollution is the transport sector, followed by power plants, industrial units, and burning of garbage. Fuel quality and engine conditions significantly influence the level of air pollution. This report focuses on the development of an air quality management system for Metro Manila and on the resulting action plan.