The air pollutants from vehicle exhaust gas are affected by many factors including fuel qualities, engine and vehicle
technologies, driving patterns. In particular, fuel qualities and after-treatment devices could directly affect the
emission level of pollutants. The pollutant reduction characteristics that caused by enforced fuel quality standard
were analyzed. Three types of test fuel were selected in accordance with Korean automotive fuel standard in 2006,
2009, 2012 and used for vehicle emission test in chassis dynamometer. European COPERT correction equation of
fuel impact was considered as reference information to quantify the vehicle emission test results.
The contribution rates of exhaust emission by COPERT correction equation showed that aromatic compounds and
oxygen contents in gasoline fuel was most important. In case of diesel fuel, cetane index and polycyclic aromatic
compounds accounted for the greater part. The exhaust emission effects by COPERT correction equation revealed
that CO and VOC was increased 0.86%, 1.57% respectively in after 2009 gasoline when compared to before 2009
gasoline fuel. In case of light-duty diesel vehicle CO, VOC and PM were decreased in range of 3~7%. The result
from this study could be provided for developing future fuel standards and be used to fundamental information for
Korean clean air act.