This paper briefly analyzes the state of vehicular pollution and contr
ol measures in Hong Kong. Vehicular emissions contribute largely to Ho
ng Kong's air pollution and will become more important as the vehicle
fleet expands. Hong Kong is unique in that a large fraction of its veh
icles use diesel engines. The analysis here explicitly accounts for th
e composition of emissions and quantifies the relative magnitude of em
issions by each of the five main sources: private cars, taxis, light b
uses, heavy buses, and lorries. The paper analyzes alternative polluti
on control policies with respect to effectiveness and efficiency.