The number of motor vehicles in Taiwan area was over 19.7 million according to the 2004 statistics of Ministry of Transportation and Communication. With the density of nearly 560 vehicle per square kilometer, which was about 2 to 20 times of those in developed countries in European, US and Japan, motor vehicles became the primary source of air pollution in urban area. Although the total number of diesel vehicle was less than 500 thousand, diesel vehicles were responsible for about 50% of both NOx and fine particulate emissions from mobile sources. Environmental Protection Administration has been strengthening the emission control over diesel vehicles to improve air quality by developing comprehensive regulations from new vehicles models to in-use diesel vehicles in the warranty period and enforcing the regulations through the implementation of this project. Measures were taken to increase the administration efficiency by streamlining the procedure of applying diesel engine and vehicle certificate. Diesel engine and vehicle emission control related regulations were continuously reviewed and amended in line with the policy of accession to World Trade Organization and global trend of emission regulations harmonization. Models for estimating pollution from highway vehicles were studied and their basic methodology was referenced to set up the model for domestic diesel vehicles pollution estimation. The pollution estimation model was developed as a reference tool to evaluate the effectiveness of various diesel vehicle control strategies in the future.

Vehicle Model Certification,Conformity of Production,Recall