Tourism impacts tourist destinations in both positive and negative ways, encompassing economic, socio-cultural, and environmental dimensions. The traditionally-described domains of tourism impacts are economic, socio-cultural, and environmental. The economic effects of tourism encompass improved tax revenue, personal income growth, enhanced living standards, and the creation of additional employment opportunities. Sociocultural impacts are associated with interactions between people with differing cultural backgrounds, attitudes and behaviors, and relationships to material goods. Environmental impacts can be categorized as direct effects including degradation of habitat, vegetation, air quality, bodies of water, the water table, wildlife, and changes in natural phenomena, and indirect effects, such as increased harvesting of natural resources to supply food, indirect air and water pollution (including from flights, transport and the manufacture of food and souvenirs for tourists).
Tourism also has positive and negative health outcomes for local people. The short-term negative impacts of tourism on residents' health are related to the density of tourist's arrivals, the risk of disease transmission, road accidents, higher crime levels, as well as traffic congestion, crowding, and other stressful factors. In addition, residents can experience anxiety and depression related to their risk perceptions about mortality rates, food insecurity, contact with infected tourists, etc., which can result in negative mental health outcomes. At the same time, there are positive long-term impacts of tourism on residents' health and well-being outcomes through improving healthcare access positive emotions, novelty, and social interactions.
About 1.4 billion people visited another country in 2019, with tourist spending contributing about US$1.45 trillion to the global economy. Europe is by far the dominant origin and arrival region for tourists, accounting for 51% of arrivals and 48% of travelers in 2019.