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You are here: Home / Data and maps / Maps and graphs / Trends in the concentration of total ammonium in rivers and between 1992 and 2002 in different countries

Trends in the concentration of total ammonium in rivers and between 1992 and 2002 in different countries

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Number of river monitoring stations included in analysis noted in brackets

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Concentrations are expressed as median of annual average concentrations. Data are from representative river stations. Stations that have no designation of type are assumed to be representative and are included in the analysis. Consistent time series trends have been calculated using only stations that have recorded concentrations for each year included in the time series (see Methodology section for further details). Consistent time series then averaged for the 3 time periods 1992 to 1995, 1996 to 1999 and 2000 to 2002.

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