The rural population rarely has sewage systems, and so surface water is badly polluted .
make something dirty or impure, contaminate, adulterate, taint, poison, foul, dirty, soil, infect befoul
شهری، مربوط به شهر
( Test )
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Older and more polluting ships will need to be replaced by models that are more efficient, and eventually carbon-based bunker fuels will need to be swapped out for low-carbon alternative fuels.
In this sentence, polluting means: