The World Health Organization (WHO) defines health as a state of complete physical, mental, and social well-being, rather than mere absence of sickness or disability. Therefore, environmental health includes all the environmental factors affecting human health and any disease with environmental etiology. In other words, it includes medical science, health, and even genetics, because many of the environmental factors cause genetic mutation and provide conditions for transmission of genetic diseases. Environmental health refers to genetically-induced pathogens and diseases in society. In other words, individual patients are studied in environmental health instead of society.  Recently, environmental factors originating from human activities that lead to stress, e.g. noise, congestion, and overcrowding, have entered the realm of environmental health, which had been previously addressed by psychiatrists and urban engineers,