Waste gas emissions from factories in various types of industries and motor vehicles in Changhua County have long been sources of air pollution. The change of urban land use types and promotion of public environmental awareness make number of factories reduce year by year but total quantity of motor vehicles increase, causing that waste gas emission becomes the main source of urban air pollution. Therefore, how to reduce waste gas emission from motor vehicle is an extreme significant issue of environmental protection in the County at present. The current registered number of motorcycles in the County is about 810,000, in which about 604,000 motorcycles in full 5 years from the manufacturing date are required for annual exhaust inspection. This program not only aims at notification and propaganda for periodical inspection of motorcycle but also conducts roadside patrol of those uninspected motorcycles for on-site inspection by posting note and mailing official letter; meanwhile, license plate identify system is also imported to tighten control of motorcycles in use, irregular and unfixed-point roadside inspection and interception executed, against high-pollution motorcycle from public complaints accepted and mobile inspection station set up to provide motorcycles in remote villages with periodic inspection services, which are to effectively control air pollution exhausted by motorcycles.

Low-Pollution Vehicle, Mobile source, Gaseous pollutant