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Caspian Regional Thematic Centres (CRTC) for pollution control: coastal and off-shore industry, Azerbaijan, Febuary 2003.
Uploaded on Wednesday 22 Feb 2012
Discharge of selected pollutants
Philippe Rekacewicz, UNEP/GRID-Arendal
Nitrogen and phosphorous represents nutrients that can be seen as pollutants, as large concentations of those increase eutrophication. Nutrients are present in primarily commercial fertilisers and in sewage. A measure of eutrophication is biochemical oxygen demand (BOD), which measures the activity in the water column. High BOD means that there is low water quality (in terms of eutrophication) and high activity of bacteria in the water. This graphic also presents tonnes of oil released in the sea.