biodegradable pollution has no recorded synonym. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is nonbiodegradable pollution.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
pollution that is rendered harmless by natural processes and so causes no permanent harm
Synonyms, antonyms and the broader and narrower relations for biodegradable pollution come from Princeton University’s WordNet. Full sources and licences.