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Figure Trends per station in dissolved inorganic nitrogen concentrations in European seas
Stations showing a statistically significant decrease (green), increase (red) or no trend (grey) of winter dissolved inorganic nitrogen (DIN) concentrations within the period 1985 to 2012. Selected stations must have data at least in the period 2007 to 2012 and at least five years data in all.
Located in Data and maps Maps and graphs
Daviz Visualization D source code River water quality
Located in Data and maps Data visualisation
GIS Map Application Ammonium in groundwater
The map shows the mean annual concentrations of ammonium (NH4+), expressed as milligrams of NO2-N per litre of water, observed in groundwater monitoring stations and reported by EEA member countries via WISE. The purpose of the map is to provide an overview of the mean annual value of ammonium in groundwater across Europe and to enable the user to compare values per country or per groundwater body, depending on the scale of visualisation. Historical data since 2000 can be displayed using the time slider, and different horizons can be selected using the layers menu.
Located in Data and maps Interactive maps
GIS Map Application Ammonium in rivers
The map shows the mean annual concentration of total ammonium (TA), expressed as milligrams of N-NH4 per litre of water, observed in river monitoring stations and reported by EEA member countries via WISE. For most countries the mean annual value is based on observations over the whole year, whereas some countries only collect samples during the growing season (due to ice cover in winter). Total ammonium concentration can increase as a result of discharges from waste water treatment plants, industrial effluents and agricultural runoff. Ammonium exerts a demand on oxygen in water as it is transformed to oxidised forms of nitrogen. It is also an important nitrogenous fertilizer for aquatic plants, so it can cause eutrophication and indirectly reduce the dissolved oxygen due to increased BOD. In addition it is toxic to aquatic life at certain concentrations in relation to water temperature, salinity and pH. For example ammonium hydroxide in water is extremely toxic to fish and aquatic life at elevated pH levels. It can also pollute drinking water and bathing water. The purpose of the map is to provide an overview of the mean annual value of total ammonium in rivers across Europe and to enable the user to compare values per country or individual monitoring station, depending on the scale of visualisation. Historical data since 1993 can be displayed using the time slider.
Located in Data and maps Interactive maps
Daviz Visualization D source code Rivers - European trends
Located in Data and maps Data visualisation
Daviz Visualization Rivers - ammonium
Located in Data and maps Data visualisation
Indicator Assessment Oxygen consuming substances in rivers (CSI 019/WAT 002) - Assessment published Feb 2015
Concentrations of biochemical oxygen demand (BOD) and total ammonium have decreased in European rivers in the period 1992 to 2012 (Fig. 1), mainly due to general improvement in waste water treatment.
Located in Data and maps Indicators Oxygen consuming substances in rivers
Daviz Visualization Ammonium concentrations in rivers in different sea regions of Europe.
Located in Data and maps Data visualisation
Daviz Visualization Ammonium concentrations in rivers in different geographical regions of Europe.
Located in Data and maps Data visualisation
Figure Total ammonium concentrations in rivers between 1992 and 2011 in different geographical regions of Europe
The data series per region are calculated as the average of the annual mean for river monitoring stations in the region. Only complete series after inter/extrapolation are included (see indicator specification). The number of river monitoring stations included per geographical region is given in parentheses. If data on total ammonium are not available, data on ammonium are included into the data series.
Located in Data and maps Maps and graphs
European Environment Agency (EEA)
Kongens Nytorv 6
1050 Copenhagen K
Denmark
Phone: +45 3336 7100