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Figure
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.
For references, please go to https://www.eea.europa.eu/data-and-maps/figures/nitrate-or-total-oxidised-nitrogen-concentrations-in-different-sized-european-rivers or scan the QR code.
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