Abstract
The Jakarta's 2005 bylaw on air pollution control, stipulates that all private car owners must get their vehicles emission tested twice a year. The vehicle owners will be given a certificate, as a requirement to extend the vehicle's registration. This paper describes an initial analysis of vehicle characteristics which influence to emission testing results. Analysis was done by using on-road emission measurements at nine major roads in Jakarta city and its surrounding cities. We apply bivariate probit model for the likelihood of CO and HC emission violations given a set of vehicles characteristics. The vehicle age, non-sedan, fuel type, carburetor and lambda all play a significant role in the determining the probability of emission test failure. However, we didn't find a significant effect of engine size on HC emission test failure. The results of study can be used as a preliminary review of the implementation of new regulation in Jakarta city.
