[en] This paper reports on the analysis of vehicular exhaust emissions and fuel consumption conducted using modal approach. The four standard driving modes are idling, accelerating, cruising and decelerating. Data were collected using instrumented test vehicles traveling many times through the urban areas of Hong Kong. Emission and fuel consumption factors were derived for each driving mode. The pollutants of interest are CO, HC, NO_x and particulates. The behaviours of different pollutants and fuel consumption for particular driving mode were studied. Finally, the application of the modal emission factors was discussed. (Author)