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Regional trends in biological oxygen demand

Year: 2005
From collection: General archive
Author: Philippe Rekacewicz, UNEP/GRID-Arendal
The graphic is a global comparison of the biological oxygen demand measured in milligrams per litre. It covers the years from 1976 - 2000. The biological oxygen demand refers to the amount of oxygen required by aerobic microorganisms to decompose the organic matter in a sample of water, such as that polluted by sewage.
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