Abstract
There are about 150, 000 fishing boats which install the diesel engine in Japan. High speed diesel engines are widely used for coastal fishing boats.In this study exhaust gas emissions characteristics such as NOx, CO and Smoke were examined by means of a high speed diesel engine for fishing boats. These emissions were measured the difference between gas oil and fuel oil A. Moreover, the relation between atmospheric humidity and NOx concentration was evaluated. Total exhausted NOx weight from whole fishing boats was calculated by NOx exhaust coefficient which obtained from this engine. It is presumed that about 136, 000 tons in terms of NO2 of NOx in a year are exhausted from fishing boats in Japan.
