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Figure
How to read the graph: between 1992 and 2007, BOD5
decreased from 4 mg O2/l to 2 mg O2/l and ammonium
from 700 μg N/l to 300 μg N/l
For references, please go to https://www.eea.europa.eu/data-and-maps/figures/trend-in-total-ammonium-nh4-concentrations-and-bod5-in-selected-wce-rivers-1992 or scan the QR code.
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