Schools can be constituted-of-or-filled-with (air pollution levels).Logical formLearned from4 sentences. Relationships can be between (air pollution).Logical formLearned from4 sentences. A us-state may have (pollution problems).Logical formLearned from4 sentences. An (air pollution control agency) can be regional.Logical formLearned from4 sentences. A majority may pertain-to an (air pollution).Logical formLearned from4 sentences. (Pollution controls) can be weak.Logical formLearned from4 sentences. Pollution may be caused by burning wood.Logical formLearned from4 sentences. A river may undergo a (pollution level).Logical formLearned from4 sentences. An estuary may undergo pollution.Logical formLearned from4 sentences. Pollution can be on a reef.Logical formLearned from4 sentences. An industrial pollution can be large-scale.Logical formLearned from4 sentences. A list can be due to (pollution problems).Logical formLearned from4 sentences. (Pollution problems) may limit a use.Logical formLearned from4 sentences. Pollution may originate in a US-city.Logical formLearned from4 sentences. A light pollution may waste energy.Logical formLearned from4 sentences.