Changes in environment had an influence on health patterns. Environmental Health (WHO) comprises those aspects of human health, including the quality of life, that are determined by physical, chemical, biological, social and psycho-social factors in the environment. It refers to the theory and practice of assessing, correcting, controlling and preventing those factors in the environment that adversely affect the health of present and future generations.
The cloudy atmosphere keeps out the sunshine, deprives people of sun-made vitamin D, thus accounting for the disease rickets. Both chronic bronchitis and carcinoma of the lung in Europe are due to atmospheric conditions, which hold down the smoke and turn mist into smog. But in strong sunshine fair skins with little pigmentation have an added liability to skin cancer. Rheumatism has been related to dampness and cold. Lack of trace elements in the soil causes diseases in ruminant animals. Temperature and humidity effect the vectors of disease. The mosquitoes carry malaria, yellow fever, dengue, encephalitis, filariasis etc.
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