Subject + 污染 + Object; Noun + 污染
污染 (wūrǎn) can function as both a verb meaning "to pollute" and a noun meaning "pollution." As a verb, it takes an object (e.g., 污染环境, "to pollute the environment"). As a noun, it can be modified by adjectives or appear in constructions like 空气污染 (air pollution).
这家工厂严重污染了附近的河流。
zhè jiā gōngchǎng yánzhòng wūrǎn le fùjìn de héliú.
This factory has severely polluted the nearby river.
空气污染是很多大城市面临的问题。
kōngqì wūrǎn shì hěn duō dà chéngshì miànlín de wèntí.
Air pollution is a problem faced by many large cities.
我们应该减少塑料对海洋的污染。
wǒmen yīnggāi jiǎnshǎo sùliào duì hǎiyáng de wūrǎn.
We should reduce plastic pollution in the oceans.