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  1. Def: All external factors living or non living, material & non material which surround man.
    1. Components:
      1. Physical: air, water, soil, housing, radiation
      2. Biologic: Plant & animals including bacteria, virus, insects, rodents etc
      3. Social: customs, culture, habits, income, occupation
    2. Sanitation: Science of safeguarding health
      1. Sanitation is a way of life
Env Sanitation: the control of all those factors in man’s physical env which exercise or may exercise a deleterious effect on his physical dev, health & survival
Now the term is replaced by env health.

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