Topics can be as pollution.Logical formLearned from7 sentences. (Air pollution) can be from plants.Logical formLearned from7 sentences. A (pollution prevention) can be effective.Logical formLearned from7 sentences. (Pollution sources) can be diffuse.Logical formLearned from7 sentences. Pollution can be from factories.Logical formLearned from7 sentences. An association can be between (air pollution).Logical formLearned from7 sentences. A range can be constituted-of-or-filled-with pollution.Logical formLearned from7 sentences. Coal-fired (power plants) can be a source of (mercury pollution).Logical formLearned from7 sentences. Sources can be constituted-of-or-filled-with (chemical pollution).Logical formLearned from7 sentences. (Air pollution problems) may pertain-to a us-state.Logical formLearned from7 sentences. Pollution can be in a state.Logical formLearned from7 sentences. Concern can be for pollution.Logical formLearned from7 sentences. (Pollution controls) can be in place.Logical formLearned from7 sentences. (Pollution levels) may increase.Logical formLearned from7 sentences. Industries may cause pollution.Logical formLearned from7 sentences.