Pollution can be in major cities.Logical formLearned from4 sentences. Some arguments can be for curbing pollution.Logical formLearned from4 sentences. An environmental pollution can be serious.Logical formLearned from4 sentences. (Air pollution) can be in developing countries.Logical formLearned from4 sentences. A (pollution problem) may pertain-to a capital.Logical formLearned from4 sentences. (Paper mills) may cause pollution.Logical formLearned from4 sentences. Pollution may pertain-to a lake.Logical formLearned from4 sentences. Pollution may be discovered.Logical formLearned from4 sentences. Chinese cities may report (air pollution).Logical formLearned from4 sentences. (Water pollution) can be in (river valleys).Logical formLearned from4 sentences. (Air pollution) may be reported in some cities of a world-city.Logical formLearned from4 sentences. A (pollution prevention) can be comprehensive.Logical formLearned from4 sentences. Pollution may undergo a prevention.Logical formLearned from4 sentences. An (air pollution) may be caused.Logical formLearned from4 sentences. (Smoke pollution) can be from fires.Logical formLearned from4 sentences.