Abstract
In this paper, we measured the mass emission of NOx and PM at the same time, which exhausted from a diesel passenger vehicle. The car was equipped with on-board system, and amount of emission gas, speed, and acceleration were measured. Consequently, in the condition where the speed and acceleration of a car were high, exhaust amount of both NOx and PM increased. Furthermore, there were conditions of the run only with the high amount of Nox and conditions of the run only with the high amount of PM.