This is the 12309th most frequent German word.
verschmutzung
Pollution.
Here, 'Verschmutzung' is used as a noun to specify the act or state of contamination or pollution affecting the river.
Die Verschmutzung des Flusses hat das Ökosystem stark belastet.
The pollution of the river has severely affected the ecosystem.
In this sentence, 'Verschmutzung' represents a specific ongoing issue concerning air quality.
Die Bewohner der Stadt kämpfen gegen die Verschmutzung der Luft.
The residents of the city are fighting against the pollution of the air.
In this usage, 'Verschmutzung' refers to the decreased presence of pollutants, leading to better environmental conditions.