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Terms & Synonyms


Official WHO Definition

The addition of harmful liquid, solid or gaseous substances to water, soil or air (WHO 1992).

Other Definitions

Generally, the presence of matter or energy whose nature, location or quantity produces undesired environmental effects, usually a human-made or human-induced alternation of the physical, biological, and radiological integrity of water, air, or soil.


Interpretations and Explanations


WHO (1992) A guide to the development of on-site sanitation

WHO Lexicon page (translations and examples)

See also

External Resources


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