pollution既不是动词也不是形容词，它是名词。pollution的动词形式是pollute，pollution的形容词形式是polluted。可以看几个例句：These gases pollute the atmosphere of towns and cities.We need more laws to stop pollution.A leakage of kerosene has polluted water supplies.

动词：pullute 污染 形容词：pulluted 被污染的。