Average concentration of nitrate in European rivers

Note: The following countries were not included in any trend analysis due to a lack of comparable data (available time series is indicated in brackets): Croatia (2003–2012); Czech Republic (1992–2008); Greece (2000–2007); Hungary (1992–2006); Kosovo* (2008–2012); Malta (no river data reported); Montenegro (2010–2012); Spain (1992–2008) and Turkey (2005–2012). *Kosovo under UNSCR 1244/99. NO3-N is nitrate as nitrogen.