Tourism represents one of the leading sectors worldwide and for this reason; its importance extends to a variety of studies and researches aimed to a better and more sustainable development. Tourism is an important added value to the economy of a city, of a region and therefore of a whole country. As a result, the development of this sector can be instrumental in improving the existing conditions in one place. But, it is not just an economic factor, but much more. It is not by chance that it is studied under different points of view such as economic, social, geographical and psychological. Tourism is an important source of revenue for the economy of a country because it brings money to the State which use it as a source to improve services, buildings, facilities and tourism destinations. In Italy, the tourism sector has a primary importance on the economy of the Country with an incidence on the Gross Domestic Product of 7% offering two million job positions. Every year facilities host more than 80 million people with about 350 million overnight stays. The aim of this study is to analyze environmental impact caused by tourism, thanks to the use of indicators, which varies regarding the tourism destination they are linked with. In particular, some environmental indicators on the city of Catania, in east of Sicily, are analyzed and their interaction could give a wide panorama of Sustainability in Catania and to identify all the advantages on sustainable tourism tools in Sicily.