Environmental Health is the field of science that studies how the environment influences human health and disease. “Environment,” in this context, means things in the natural environment like air, water and soil, and also all the physical, chemical, biological and social features of our surroundings.
The man-made, or “built”, environment includes physical structures where people live and work, such as homes, offices, schools, farms and factories, as well as community systems such as roads and transportation systems, land- use practices and waste management.
Consequences of human alterations to the natural environment, such as air pollution, are also parts of the man-made environment.
The social environment encompasses lifestyle factors like diet and exercise, socioeconomic status and other societal influences that may affect health – National Institute of Environmental Health Science