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Between 2001-2017 there was a slight increase in ammonium concentration and a slight decrease in BOD (by 32 % and 25 %, respectively, if comparing the average of the last three years to that of the first three years) in Azerbaijan. However, BOD has increased from its minimum level in 2012, while ammonium has decreased in recent years. For both pollutants there was a period with higher levels than currently.  For BOD this happened mainly before 2008, while it occurred mainly after 2008 for ammonium. The time series patterns seen at the national level are broadly similar at the regional level.

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