The book "Reports on the state of sanitation of the city of London" by John Simon is an important document that reflects the situation with hygiene and sanitary conditions in London. In the book, the author systematically describes various aspects of the sanitary state of the city, provides an analysis of factors affecting the general state of health of residents. The information provided in the reports became an important means of monitoring and improving the sanitary and hygienic living conditions of Londoners. The book gives readers a window into the past, showing what the level of sanitation was in London at a certain historical period. "Reports on the sanitary condition of the city of London" facilitate the understanding of the importance of preserving public health and the formation of effective strategies for managing sanitary issues in cities.