Yanmar's marine diesel engines are in compliance with global emissions standards
With a thermal efficiency of over 40%, diesel engines compare favorably to gasoline and can go a long way towards reducing the impact of engines on the environment. Unfortunately, diesel engines are also known for the exhaust they emit, which contains levels of particulate matter (PM) and nitrous oxides (NOx) that can contribute to air pollution. From the late 1990s, regulations on marine diesel exhaust emissions have been implemented and strengthened in countries all over the world. Yanmar has been active in conducting research towards clean emissions for diesel engines and early on cleared the strict US EPA (US Environmental Protection Agency) regulations as well as regulations from many other countries.