A world-city may suffer from pollution.Logical formLearned from6 sentences. (Air pollution) may hit levels.Logical formLearned from6 sentences. Residents may complain of pollution.Logical formLearned from6 sentences. An understanding can be about an extent of (chemical pollution).Logical formLearned from6 sentences. Topics may include pollution.Logical formLearned from6 sentences. Some cities can be for (air pollution).Logical formLearned from6 sentences. Pollution may wipe_out some life.Logical formLearned from6 sentences. (Pollution leeching) may reach a river.Logical formLearned from6 sentences. A picture may show pollution.Logical formLearned from6 sentences. (Soil pollution) can be in homelands.Logical formLearned from6 sentences. (Vacuum cleaner) may suck_up (water pollution).Logical formLearned from6 sentences. (Air pollution) may endanger public health.Logical formLearned from6 sentences. Action can be on pollution.Logical formLearned from6 sentences. Pollution may damage health.Logical formLearned from6 sentences. (Pollution measures) may be introduced on a month.Logical formLearned from6 sentences.