Protests can be over an (air pollution).Logical formLearned from4 sentences. Knowledge may pertain-to a (pollution hazard).Logical formLearned from4 sentences. A reservoir may undergo pollution.Logical formLearned from4 sentences. Pollution can be at sites.Logical formLearned from4 sentences. Pollution can be effluent.Logical formLearned from4 sentences. Pollution may cause concern.Logical formLearned from4 sentences. Problems can be with (air pollution).Logical formLearned from4 sentences. A market can be for (pollution rights).Logical formLearned from4 sentences. An (air pollution legislation) can be in a history.Logical formLearned from4 sentences. Pollution can be acute.Logical formLearned from4 sentences. An (air pollution) can be rampant.Logical formLearned from4 sentences. Pollution may be originated.Logical formLearned from4 sentences. Pollution may come to light.Logical formLearned from4 sentences. A means can be constituted-of-or-filled-with (pollution control).Logical formLearned from4 sentences. Watercourses may undergo pollution.Logical formLearned from4 sentences.