Council Directive (91/271/EEC) of 21 May 1991

Policy Document
Council Directive of 21 May 1991 concerning urban waste water treatment (91/271/EEC)

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Chlorophyll in transitional, coastal and marine waters  The indicator illustrates the geographical distribution and trends in mean summer surface concentrations of chlorophyll-a (micrograms per litre) in the regional seas of Europe. The summer period is defined as: June to September for stations north of latitude 59 degrees in the Baltic Sea (Gulf of Bothnia and Gulf of Finland) May to September for all other stations The following marine regions and subregions are covered, in line with the Marine Strategy Framework Directive (sub)regions:   Regions Subregions Baltic Sea None North-East Atlantic Ocean Greater North Sea Celtic Seas Bay of Biscay and Iberian coast Macaronesian biogeographic region Mediterranean Sea Western Mediterranean Sea Adriatic Sea Ionian Sea and Central Mediterranean Aegean-Levantine Sea Black Sea None  
Nutrients in transitional, coastal and marine waters The indicator illustrates the following levels and trends in concentrations in the regional seas of Europe: winter means of dissolved inorganic nitrogen (nitrate + nitrite + ammonium) winter means of orthophosphate annual means of total nitrogen annual means of total phosphorus The winter period is defined as follows: January, February and March for stations east of longitude 15 degrees (Bornholm) in the Baltic Sea January and February for all other stations. The following marine (sub)regions are covered, in line with the Marine Strategy Framework Directive (sub)regions: Regions Subregions Baltic Sea None North-East Atlantic Ocean Greater North Sea Celtic Seas Bay of Biscay and the Iberian coast Macaronesian biogeographic region Mediterranean Sea Western Mediterranean Sea Adriatic Sea Ionian Sea and Central Mediterranean Aegean-Levantine Sea Black Sea None
Chlorophyll in transitional, coastal and marine waters This indicator illustrates the levels and trends in mean summer surface concentrations of chlorophyll-a (microgram/l) in the regional seas of Europe.
Nutrients in transitional, coastal and marine waters This indicator illustrates the levels and trends in winter means of dissolved inorganic nitrogen (nitrate + nitrite + ammonium), oxidised nitrogen (nitrate + nitrite) and phosphate concentrations (micromol/l) in the regional seas of Europe.
Chlorophyll in transitional, coastal and marine waters The indicator shows 1) annual mean summer surface concentrations (microgram/l), 2) classification of concentration levels (i.e. low, moderate, high) and 3) trends in mean summer surface concentrations of chlorophyll-a (microgram/l) in the regional seas of Europe. Summer period is: June to September for stations north of latitude 59 degrees in the Baltic Sea (Gulf of Bothnia and Gulf of Finland)  May to September for all other stations  The used regional and subregional seas of Europe are in line with the geographical regions and sub-regions specified in the Marine Strategy Framework Directive (MSFD).  Other European Seas (Icelandic Sea, The Norwegian Sea, the Barents Sea and the White Sea) are not covered in this indicator due to current lack of data.
Nutrients in transitional, coastal and marine waters The indicator shows 1) annual winter concentrations (micromol/l); 2) classification of concentration levels (i.e. low, moderate, high) and 3) trends in winter oxidised nitrogen (nitrate + nitrite) and phosphate concentration (micromol/l)in the regional seas of Europe.  Levels and trends of winter concentrations of dissolved inorganic nutrients are used for this indicator, as it is assumed that winter concentrations are not significantly reduced due to uptake by primary producers. The winter period is defined as follows: January, February and March for stations east of longitude 15 degrees (Bornholm) in the Baltic Sea  January and February for all other stations. The used regional and subregional seas of Europe are in line with the geographical regions and sub-regions specified in the Marine Strategy Framework Directive (MSFD).  Other European Seas (Icelandic Sea, The Norwegian Sea, the Barents Sea and the White Sea) are not covered in this indicator due to current lack of data. 
Nutrients in freshwater in Europe This indicator shows concentrations of orthophosphate and nitrate in rivers, total phosphorus in lakes and nitrate in groundwater bodies. The indicator can be used to illustrate geographical variations in current nutrient concentrations and temporal trends.
Urban waste water treatment The indicator on urban waste water treatment, CSI 024, collects data on the percentage of the population connected to sewage collection systems, as well as on the prevalence of primary, secondary and tertiary urban waste water treatment plants. The amount of urban waste water treated is expressed as population equivalents (p.e.). The indicator illustrates: the development of urban waste water collection and treatment in Europe since the 1970s; the development of more stringent urban waste water treatment practices; the level of urban waste water treatment in 'big cities' (agglomerations of > 150 000 p.e.) in the EU.
Oxygen consuming substances in European rivers This indicator illustrates the current situation regarding  biochemical oxygen demand ( BOD) and concentrations of total ammonium (NH 4 ) in rivers and examines trends in both. The key indicator for the oxygenation status of water bodies is BOD, which is the demand for oxygen resulting from organisms in water that consume oxidisable organic matter.

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