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Common layers: Danube River Basin District (DRBD), Danube, Tributaries (river basins > 4,000 km²), Lakes (surface area > 100 km²), Lagoons (surface area > 100 km²), Black Sea Coastal Catchments, Canals, National borders, Cities
Scale: 1 : 4,500,000

Organic pollution has been on the rise in the Danube over the last century, as human activities have resulted in increasing loads of wastewater rich in organic matter. The most serious organic pollution problems occur in tributaries that regularly receive untreated or inadequately treated wastewater from industrial plants and municipalities. Thanks to the significant improvement of wastewater infrastructure and services in the Danube countries, the basin-wide organic emissions reduced by 60% since the mid 2000s.