According to the records from January 2004 to October 2004, there were 349 certificates issued this year, which include 662 vehicle types. Over 400 certificates issued this year are expected. The dates required for certification process averaged 8.5 dates in compliance with requests of the public and R.O.C EPA. The test results for the average emission values were not lowered compared with the average emission values for the year 2003, and for the year 2005 the values were even rising. The most significant ones were the CO value and the NMHC value for imported commercial vehicles. As to the “Conformity of Production Program”, the average values for the conformity of production tests since 1999 were similar to the average values for the new vehicle exhaust emission tests. The CO value and the NMHC value for the year 2004 were up trend. The results of the conformity of production tests could represent current pollution condition of new vehicle. But the average values for the new vehicle exhaust emission tests should be objectively considered as a significant data. As to the in-use vehicles conformity tests, there were 10 engine families put to the basic test and 1 engine family put to the final test. Up to now, there were few possibilities that in-use vehicles exceed the standard values, but the average values for the new vehicle exhaust emission tests. There are two possibilities for the result. The first one is that the tested vehicles, breakdown tests, deterioration coefficient were controlled on purpose. The other one is that the environment quality was worse in Taiwan. However, the in-use vehicles conformity tests are the last and the most important part of motor vehicle exhaust emission control; therefore, a certain proportion of vehicle number under investigation tests each year is necessary. The implement of this regulatory strategy could prevent type approval applicants from ignoring the breakdown guarantee.

Certification