(Air pollution) may result from a use of coal.Logical formLearned from3 sentences. Pollution may be caused by sources.Logical formLearned from3 sentences. An (air pollution index) can be for a period.Logical formLearned from3 sentences. A country may suffer from (arsenic pollution).Logical formLearned from3 sentences. Industrial pollution can be in a world-city.Logical formLearned from3 sentences. A (radiation pollution) can be man-made.Logical formLearned from3 sentences. A capital may face (air pollution).Logical formLearned from3 sentences. A (pollution problem) can be serious.Logical formLearned from3 sentences. (Pollution problems) may pertain-to a river.Logical formLearned from3 sentences. Pollution can be in urban areas.Logical formLearned from3 sentences. A battle can be against pollution.Logical formLearned from3 sentences. (Air pollution) can be a risk.Logical formLearned from3 sentences. Pollution can be destructive.Logical formLearned from3 sentences. Industries may cause pollution.Logical formLearned from3 sentences. (Pollution problems) can be known.Logical formLearned from3 sentences.