The book “Application of gas analysis in the test of internal combustion engines” by Sergey Lebedev is a unique publication that immerses the reader in the world of modern technologies and methods used to analyze the operation of internal combustion engines. In the context of the rapid development of the automotive industry and increasing environmental requirements, this book becomes an indispensable tool for engineers, students of technical universities and anyone interested in the automotive industry and energy technologies. Sergey Lebedev, a well-known specialist in the field of engine building, shares his rich experience and knowledge, offering the reader not only theoretical calculations, but also practical recommendations for the use of gas analysis. The book discusses the basic principles of internal combustion engines, as well as methods to assess their effectiveness and environmental friendliness. Lebedev emphasizes the importance of gas analysis as a tool for diagnosing and optimizing the operation of engines, which makes the book especially relevant for specialists working in the field of development and testing of new engines. Readers interested in the topics of ecology, energy technology and the automotive industry will find in this book a lot of useful information. It will be useful for both students and experienced engineers who want to expand their knowledge of modern testing and analysis methods. The book will be an excellent addition to the training materials and will help to better understand the complex processes occurring in the engines. The topics raised in the book cover a wide range of issues, including the impact of various factors on emissions of harmful substances, methods for improving fuel combustion efficiency and ways to reduce harmful emissions into the atmosphere. Lebedev not only describes existing technologies, but also shares his views on the future of engine building, emphasizing the need to introduce innovative solutions to achieve environmental sustainability. The author's style is clear and accessible, which allows even complex technical aspects to be explained in simple language. Lebedev uses many examples from practice, which makes the material more clear and understandable. His previous works, such as “Internal Combustion Engines: Theory and Practice” and “Modern Technologies in the Automotive Industry”, have already established themselves as authoritative sources in the field of engine building, and the new book will not disappoint readers. The book “Application of gas analysis in the test of internal combustion engines” is not just a textbook, but a real find for everyone who wants to be one step ahead in their professional activities. It helps to understand how modern methods of analysis can significantly affect the quality and safety of engines, as well as the environmental situation in the world. If you are looking for information on how gas analysis can change the approach to engine testing, or want to learn about new technologies in the field of engine building, this book will become your reliable assistant. Do not miss the opportunity to get acquainted with the work of Lebedev - it will open up new horizons in the understanding of internal combustion engines and their tests.