Part per billion


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Terms & Synonyms

Official WHO Definition

One part per billion is one part in one billion by volume (WHO et al. 2003).  A unit of proportion equal to 10-9 (Symons et al. 2000).See ppb 

Other Definitions


Interpretations and Explanations

In water, micrograms per litre (ug/L) is frequently used when referring to parts per billion (Symons et al. 2000). 


Symons, J. M., Bradley, L. C. Jr. and Cleveland, T. C.  2000.  The Drinking Water Dictionary. American Water Works AssociationWHO, WMO and UNEP (2003) Climate change and human health: Risks and responses


WHO Lexicon page (translations and examples)

See also

External Resources


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