Mobile pollution source is the main cause for the urban air quality decline, the diesel vehicle exhaust emission is concerned by both environmental and transportation departments as control priority. In order to control the issue of diesel vehicle exhaust, the EPA has set up diesel vehicle emission inspection station in each local authority and together with public reported the emission fact and visual inspector to inform those may contain high level of pollutant vehicles to take. Above all is to reduce the diesel vehicle smoke emission situation. For better inspection quality in every counties and cities, the EPA has implemented an evaluation project on diesel vehicle exhaust emission inspect station, correlation test for confirm the inspect result from each station were the same, the examination of archive in every diesel vehicle exhaust emission inspect stations, and development of the control policies of diesel vehicles; including the regular and irregular inspection, low pollution vehicles and after-treatment , etc.; to effectively confirm the quality of examination on diesel emission inspection affair. On diesel regular emission inspection affair, in addition to the information of regular inspection in 2006 from motor vehicle supervision organizations, the explanatory meeting was conducted at the highway supervision organizations for their quality assurance ＆ quality control relevant to the emission inspection for diesel vehicles; furthermore, EPA has helped 20 person-time of the highway supervision organizations obtain the certificate of training qualification to be qualified as the “Inspector for the instrument of emission smoke from diesel vehicles” so as to promote the quality for carrying out the regular inspection of diesel vehicles. More over, EPA also led in the analyzer of opacity which R-squared value higher than 0.8 was obtained from the linear regression between the full-load smoke and the opacity while the value ranging 0.6 ~ 0.7 was derived at no-load according to the comparison between the opacity test results with the smoke meter; thus the outcome indicates that smoke meter and opacity meter are highly and positively correlated. Other related works include the arrangement of various meetings and the publication of promotion materials. The results will be presented in the report in detail.

diesel exhaust inspection, mobile source control, proficiency testing