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Figure
For countries that report only total oxidised nitrogen (TON = NO3 NO2) and not nitrate alone, the map shows the TON-N data, taken as an estimate for NO3. In most rivers TON-N will be almost the same as NO3-N. Note that these data are not yet quality-checked. Certain values and colour codes might therefore be incorrect.
For references, please go to https://www.eea.europa.eu/data-and-maps/figures/annual-average-river-nitrate-concentration or scan the QR code.
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