This map shows the mean annual concentrations of Nitrate (NO3) as mg/L NO3-N measured at Eionet-Water River monitoring stations during 2008. All data are annual means. For most countries these are based on measurements over the whole year, whereas some countries have samples only from the growing season (due to ice cover in winter)
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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.