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Countries with more than 50 % of all river stations with the lowest total ammonium concentrations (class 1: < 0.04 mg N/l) for 2009 or the latest reported year are Spain, Austria, Cyprus, Croatia, Sweden, Bosnia and Herzegovina, Ireland, Slovenia, Finland, the United Kingdom, Iceland, Liechtenstein and Norway. Countries with 20 % or more stations with the highest total ammonium concentrations (class 5: >= 0.4 mg N/l) are FYR of Macedonia, Greece, Romania, Bulgaria, Luxembourg, Albania and Belgium.