**Preface to "Marine Engines Performance and Emissions"**

Marine engines are key components in most ships. Nowadays, diesel engines power most of the ships in the world. These engines are efficient in comparison with other thermal machines, but emit harmful species such as nitrogen oxides, soot, carbon dioxide, sulfur oxides, carbon monoxide, etc. Several international, national, and regional policies have been developed to limit pollutants from engines. Due to these increasingly restrictive regulations, several pollution reduction methods have been developed in recent years. Besides, the performance of marine engines is vital for the efficiency, environment, and safety. According to this, innovative solutions are being increasingly developed in the recent years. This book contains a collection of peer-review scientific papers about developments in the research of marine engines performance and emissions. Innovative researchers are provided. These papers were developed by 39 authors from The Netherlands, Finland, Sweden, Korea, Slovakia, China, Chile, Ukraine, Poland, and Spain. Most papers treat about emissions from marine engines, but the performance is also treated.

> **Mar´ıa Isabel Lamas Galdo** *Editor*
