Pollution can be terrible.Logical formLearned from5 sentences. (Air pollution) can be thick.Logical formLearned from5 sentences. Studies may pay attention to pollution.Logical formLearned from5 sentences. Pollution can be as conventional oil.Logical formLearned from5 sentences. A return may pertain-to an (air pollution).Logical formLearned from5 sentences. (Pollution facts) may affect the earth.Logical formLearned from5 sentences. Pollution may destroy an environment.Logical formLearned from5 sentences. (Air pollution) can be from an automobile.Logical formLearned from5 sentences. Some snowmobiles may increase (air pollution).Logical formLearned from5 sentences. Concern can be about pollution.Logical formLearned from5 sentences. Pollution may be caused by vehicles.Logical formLearned from5 sentences. Pollution may pertain-to humanity.Logical formLearned from5 sentences. Persons may reduce pollution.Logical formLearned from5 sentences. Some causes can be constituted-of-or-filled-with pollution.Logical formLearned from5 sentences. Illness may be caused by pollution.Logical formLearned from5 sentences.