An indicator can be constituted-of-or-filled-with pollution.Logical formLearned from29 sentences. A (pollution prevention) can be integrated.Logical formLearned from29 sentences. Pollution may pertain-to a river.Logical formLearned from29 sentences. (Air pollution) can be in a US-city.Logical formLearned from29 sentences. Seas may undergo pollution.Logical formLearned from29 sentences. Pollution may take a toll.Logical formLearned from29 sentences. Pollution can be high.Logical formLearned from29 sentences. Pollution may get worse.Logical formLearned from28 sentences. (Water sources) may undergo pollution.Logical formLearned from28 sentences. A planet may undergo pollution.Logical formLearned from28 sentences. (Ground water) may undergo pollution.Logical formLearned from28 sentences. Pollution can be extreme.Logical formLearned from28 sentences. Pollution can be long-term.Logical formLearned from28 sentences. Pollution can be from an (oil industry).Logical formLearned from28 sentences. Pollution can be from industries.Logical formLearned from28 sentences.