Current Situation and Prospects of Motorcycle Pollution Control in Taiwan, Republic of China
Due to limited land and dense population, warm weather, and short distance between working location and residence, it is convenient and popular in Taiwan to use motorcycle as transportation means, which also becomes a special local feature. According to the statistics on vehicles, the number of vehicles reached 12,547,973 by the end of 1991, among which 9,232, 889, i.e. 73.4 percent, was motorcycle. It was estimated that the percentages of air pollutants emitted by motorcycle in respective total vehicle emission in 1991 were as following: CO 37.7%, HC 60.8%, NOx 2.9%. From the above statistical figures, we can comprehend the seriousness of HC pollution from motorcycles. Since November 1, 1984, R.O.C. has applied a standard to control CO and HC concentrations in motorcycle emission. Beginning from July 1, 1991, the emission standard became more stringent, as lowering CO emission to 4.5 g/km and HC plus NOx to 3.0 g/km (test procedure is the same as ECE 15).