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[EU SDG 06_30] Biochemical oxygen demand in rivers

The indicator shows biochemical oxygen demand (BOD) concentration in rivers, which is the amount of oxygen needed by microorganisms for aerobic decomposition of organic matter. ...

18 Dec 2024

Topics: Pollution, Water, Sustainability

Source: Datahub/en/datahub/datahubitem-view/bd6a37dd-ddec-4446-8d03-95fbaf0896e9

Maps and chartsFigure (chart/map)

Occurrence of reduced oxygen concentrations in Europe's coastal and marine waters (average for the years 2011-2022)

Observations are aggregated at the level of 100*100 km grid cells, and show the mean 25-percentile of dissolved oxygen (DO) concentrations subdivided in four classes (<2 mg/l, 2-4 mg/l, 4-6 mg/l, >6 mg ... Oxygen concentrations above 6mg/l are considered to support marine life with minimal problems while concentrations less than 2mg/l (hypoxia, oxygen deficiency) are considered to cause severe problems. ...

8 May 2024

Topics: Climate change adaptation, Water

Source: European Environment Agency / en / analysis / maps-and-charts

PublicationsIndicator

Oxygen concentrations in Europe's coastal and marine waters

The occurrence of reduced oxygen concentrations in near-seafloor waters is increasing, largely due to a combination of natural causes and human-induced pressures including excess nutrient inputs and climate ... Over 25% of assessed areas reveal reduced concentrations (<6mg/l), falling below the threshold needed to support marine life with minimal stress. ... There, oxygen-depleted zones are caused by restricted vertical mixing of water layers, intensified by eutrophication and ocean warming. Areas in the Mediterranean Sea are also particularly affected. ...

13 May 2024

Topics: Climate change adaptation, Seas and coasts, Water

Source: European Environment Agency / en / analysis / indicators

OthersWebpage

Physico-chemical quality elements

If these parameters are not in good or high status, there may be effects on the species able to live in the water body, for example if the oxygen concentration is low or nutrient concentrations are high ...

18 Mar 2024

Topics: Water

Source: Freshwater Information System for Europe / freshwater / europe-freshwater / wate ...

PublicationsIndicator

Dissolved Oxygen Level

A higher/lower index value indicates higher/lower oxygen content and thus lower/higher risk. ... Oxygen concentrations above 190 mmol m³ are considered to be sufficient to support healthy marine communities with minimal problems, while oxygen concentrations below 62.5 mmol m³ are considered to be ... Definition The Dissolved Oxygen Level index (mol / m³) is the concentration of dissolved oxygen at a certain depth. ...

26 Sep 2024

Topics: Climate change adaptation

Source: Climate Adaptation Platform / en / metadata / indicators

PublicationsReportPDF

ETC HE Report 2023/8: Long-term trends of air pollutants at European and national level 2005-2021

Sulphur dioxide shows the largest decrease of all pollutants with a concentration reduction of the order of 62-68 %. ... While the overall NOx emissions are reported to be reduced by 55 %, the measured NO2 data indicate a decline of the order of 38 %. ... For O3, our findings are in line with earlier published studies noting that the annual mean ozone concentration has increased while the high peaks have been reduced. ...

4 Dec 2023

Topics: Various other issues

Source: European Environment Information and Observation Network (Eionet) / etcs / etc-he / products

OthersFilePDF

08-Nitrate in groundwater-indicator

INDICATOR, 2023 Nitrate in groundwater 8th Environment Action Programme Analysis and data Indicators Nitrate in groundwater Despite legislation addressing nutrient pollution, the average nitrate concentration ... In addition, the number of groundwater monitoring stations with nitrate concentrations greater than 50mg/l, has not been reduced. ...

17 Dec 2023

Topics: Various other issues

Source: European Environment Agency / publications / european-union-8th-env ...

PublicationsIndicator

Oxygen consuming substances in European rivers

In European rivers, oxygen consuming substances decreased over the period 1992 to 2022. ... Biochemical oxygen demand (BOD) fell to half of the 1992 level, but has been fluctuating at around 2.7mgO 2 /l since 2010. Ammonium concentrations fell to 20% of the 1992 level. ...

18 Dec 2024

Topics: Water

Source: European Environment Agency / en / analysis / indicators

PublicationsIndicator

Oxygen concentrations in European coastal and marine waters

Widespread oxygen depletion, partly due to natural conditions (stratification), occurs in the Baltic Sea and the Black Sea. ... Reduced oxygen concentrations were observed at some stations in the coastal waters of the Black Sea, but there were no significant trends in oxygen concentrations during the period 1990-2017. ... The primary cause of oxygen depletion is nutrient input from agricultural fertilisers, causing eutrophication. ...

9 Dec 2020

Topics: Climate change adaptation

Source: Climate Adaptation Platform / en / metadata / indicators

PublicationsReportPDF

ETC/ATNI Report 9/2021: Long-term trends of air pollutants at national level 2005-2019.

While the overall NOx emissions are reported to be reduced by 45 %, the measured NO2 data indicate a decline of the order of 30 %. ... For O3, our findings are in line with earlier published studies noting that the annual mean ozone concentration has increased while the high peaks have been reduced. ...

31 Jan 2022

Topics: Air pollution, Pollution

Source: European Environment Information and Observation Network (Eionet) / etcs / etc-atni / products

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