Mobile pollutant 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 setting up diesel vehicle exhaust emission inspect 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 the emission test. Above all is to reduce the diesel vehicle smoke emission situation. For better inspection quality in every counties and cities, the EPA has authorized a well-known consultant company to handle an evaluation project on diesel vehicle exhaust emission inspect station. The main aim of the project is focusing on the condition of current operating diesel vehicle exhaust emission inspect stations, inspect facilities, inspect procedures and report QA/QC for twice auditing and evaluating. In order to maintain the inspect quality and enforce the law in local authorities, the consultant held seminars after every auditing. During the project period had twice correlation test for confirm the inspect result from each station were the same, meanwhile for the correlation result that dissimilar from others, will take a deep step to investigate the cause and the event will provide local authorities for further improvement. The project has been required to established and implement the diesel vehicle inspection data base system to resolve the problem of repeated inform the same diesel vehicles to take inspection as well as the inspect result data feedback from other counties or cities. Other related works are including to traced diesel engine minibus pollution inspect, contrast between opacity and emission grade, Chassis Dynamometer Smoke Test (CDST), discussion on related regulation and inspect procedure, and to evaluate the possibility of future policy direction to promote diesel vehicle regular inspect system.

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