Changhua County has been a city of industrial and agricultural development for a long time. The primary source of air pollution in this county is the waste gases emitted from diverse types of factory and variety of motor vehicles; and in the wake of the change from the pattern of urban land utilization along with the promotion of populace’s awareness of environmental protection, the total number of factory has been decreasing year by year; contrarily, the total number of motor vehicle in use has been increasing year after year that makes the emission of exhaust gas from motor vehicles the most critical source of urban air pollution. Therefore, how to reduce the emission of exhaust gas from motor vehicles has become the extremely important issue of environmental protection for Changhua County.
According to the statistical data from July 15th 2009 to May 14th 2010; this project has achieved a mobile-type scheduled maintenance service to inspect & test the vehicles free of charge at 40 places. 427,831 motorcycles have been conducted the scheduled maintenance at an average scheduled-maintenance rate of 81.58%; apparently the acceptability from the populace toward the compulsorily scheduled maintenance is on the rise year after year. The statistic data of scheduled maintenance show that most of the motorcycles are registered to Changhua County and Taichung County while vehicles from other counties and cities occupy 30% approximately. Regarding the reduction of emission volume, the control measures mainly focused on the acceleration to obsolete the old & used motorcycles, improving the effectiveness of motorcycle through scheduled maintenance, audit operation of irregularly scheduled maintenance for motorcycles, etc. As calculated the data of reduction volume from Environmental Protection Administration, Changhua County has achieved a reduction volume of 284.78 metric tons in year NMHC and 1390.18 metric tons in year CO.
In the aspect of controlling the diesel vehicles, 4,212 vehicles inspected & tested thereof smoke emission while 376 vehicles therein failed to pass the inspection at a nonconformity rate of 8.9%. With regard to the oil sampling, 2,846 oil samples were taken while 302 oil samples therein were screened and submitted for inspection. 4 oil samples failed to pass the inspection amongst 302 inspected oil samples at a nonconformity rate of 1.3%. 31,329 vehicles failed to pass the visual determination and followed an inquiry of registration data, screening and report for scrapping, handing in for cancellation, suspension of driving, etc. factors; totally 1,658 letters of notice for inspection & test works were dispatched. As for the reduction volume, primary efforts have been made to obsolete the old & used diesel vehicles, improve the effectiveness against the pollution from diesel vehicle and launch the autonomous management to service providers of diesel vehicle, launch the use of low-pollution vehicles, etc. Consequently, Changhua County achieved a reduction volume of 47.5 metric tons in 2009 according to the data of reduction volume from Environmental Protection Administration.
This project, by executing variety of vehicular control measures together with cooperation cross the bureaus and divisions plus a propagation to the populace; Changhua County has achieved a practical effect and a complete performance to improve the air quality.