Nitrate or total oxidised nitrogen concentrations in different sized European rivers

Figure Created 12 Nov 2009 Published 12 Nov 2009 Last modified 29 Nov 2012
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Median of measured annual average concentrations



Additional information

Total oxidised nitrogen (TON) is the sum of nitrate and nitrite. Some countries monitor TON instead of nitrate. Nitrite levels are often much lower than nitrate, and therefore for the purposes of this assessment, nitrate and TON are considered to be approximately equivalent.

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