(Air pollution problems) may pertain-to persons.Logical formLearned from9 sentences. Pollution may cause (acid rain).Logical formLearned from9 sentences. Pollution may undergo an understanding.Logical formLearned from9 sentences. Compliance can be with (air pollution regulations).Logical formLearned from9 sentences. Standards can be for (air pollution).Logical formLearned from9 sentences. A part may pertain-to pollution.Logical formLearned from9 sentences. Persons may talk about pollution.Logical formLearned from9 sentences. Pollution can be issues.Logical formLearned from9 sentences. Pollution can be high.Logical formLearned from9 sentences. An (air pollution) may pertain-to a continent.Logical formLearned from9 sentences. Damage may be caused by pollution.Logical formLearned from9 sentences. Aquifers may undergo pollution.Logical formLearned from9 sentences. Pollution can be continuous.Logical formLearned from9 sentences. A look can be at some (pollution sources).Logical formLearned from9 sentences. (Pollution prevention) may undergo an implementation.Logical formLearned from9 sentences.