This is the 6576th most frequent Dutch word.
vervuild
Polluted.
Here, 'vervuild' is used as an adjective to describe the condition of the air being contaminated.
De lucht in de stad is vervuild door de uitstoot van auto's.
The air in the city is polluted by car emissions.
In this example, 'vervuild' again functions as an adjective, indicating the river water's state of having been polluted.
Het water van de rivier is vervuild door chemisch afval.
The river water is polluted by chemical waste.
Here, 'vervuild' is part of a verb phrase, expressing the process of the soil becoming polluted over time.