Biochemical Oxygen Demand (BOD5) and total ammonium concentrations in rivers between 1992 and 2007

• Austria
• Belgium
• Czechia
• Denmark
• Estonia
• Finland
• France
• Germany
• Hungary
• Latvia
• Lithuania
• Poland
• Slovakia
• Slovenia
• Sweden

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