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Severe organic pollution may lead to rapid de-oxygenation of river water, a high concentration of ammonia and the disappearance of fish and aquatic invertebrates.
Concentrations of total ammonium have decreased in European rivers over the last 15 years, corresponding to the general improvement in wastewater treatment. The decrease is due mainly to improved sewage treatment resulting from the implementation of the Urban Wastewater Treatment Directive.
The map shows pie charts of the average mean annual concentrations of ammonium measured at Eionet-Water River monitoring stations by country during 2005. The size of each segment of the pie charts is proportional to the number of stations with ammonium concentrations falling within defined concentration limits. The segments are coloured according to the different concentration levels.
For references, please go to https://www.eea.europa.eu/archived/archived-content-water-topic/map-of-the-week/ammonium-in-rivers-for-2005-by-country or scan the QR code.
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