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Terms & Synonyms

Official WHO Definition

Water droplets that are generated within a device (such as a cooling tower or evaporative condenser), and carried in the airflow without initial evaporation (WHO 2006).

Other Definitions


Interpretations and Explanations

The water droplets in drift will contain any dissolved salts or suspended particles, including organisms that were in the original water. It is these droplets that can create an infectious aerosol when the water evaporates in the open air outside the tower, unless appropriate controls are in place (WHO 2006).


WHO (2006) Legionella and the prevention of legionellosis


WHO Lexicon page (translations and examples)

See also

External Resources


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