(Air pollution) may decline.Logical formLearned from17 sentences. Sources can be constituted-of-or-filled-with pollution.Logical formLearned from17 sentences. Pollution may be produced.Logical formLearned from17 sentences. Pollution can be pharmaceutical.Logical formLearned from17 sentences. A bit can be constituted-of-or-filled-with pollution.Logical formLearned from17 sentences. An effect may pertain-to pollution.Logical formLearned from17 sentences. A portion may pertain-to pollution.Logical formLearned from17 sentences. An environmental pollution can be heavy.Logical formLearned from17 sentences. (Pollution levels) can be unhealthy.Logical formLearned from17 sentences. Pollution can be in a capital.Logical formLearned from17 sentences. A (carbon pollution) may pertain-to a country.Logical formLearned from17 sentences. A mine may cause pollution.Logical formLearned from17 sentences. (Pollution problems) may pertain-to a country.Logical formLearned from17 sentences. Pollution can be problems.Logical formLearned from16 sentences. Sources may pertain-to pollution.Logical formLearned from16 sentences.