With the development of economy, the progress of industrial and commercial society and the increase of GNP, the demands for life quality increase, resulting in the fast growth in number of mobile vehicles. However, with relatively small territory and dense population in Taiwan, the quality of air in urban areas deteriorates every day. It is reported that 87.8% of the total emission of urban air pollutants comes from mobile pollution sources. Owing to the fact that most vehicle ownersdo not pay enough attention to routine maintenance, it is necessary to carry out periodical vehicle inspections by imposing mandatory requirements on vehicle owners to keep the vehicles they own or drive properly maintained in order to enable the compliance to emission standard for aged vehicles. In order to solve this problem permanently, Environment Protection Bureau, Taoyuan County Government has taken strict measures for diesel vehicles in use. In addition to intensifying roadside visual inspections on high pollution potential vehicles, the inspections have been actively underway in various emission inspection stations. Hopefully through both punishing and awarding measures, the vehicle owners are motivated to pay constant attention on the exhaust emission of their vehicles, and give proper maintenance and improvement to them when inspected as disqualified. Only in doing so, the air quality in the urban areas of Taoyuan Countywill be truly improved.

Diesel oil vehicles’,waste gas emission