A reason can be for (air pollution).Logical formLearned from3 sentences. (Air pollution) can be in a capital of a world-city.Logical formLearned from3 sentences. A (water pollution) can be accidental.Logical formLearned from3 sentences. Pollution may be discharged.Logical formLearned from3 sentences. Air may undergo (pollution levels).Logical formLearned from3 sentences. Progress can be in controling pollution.Logical formLearned from3 sentences. A world-city may report pollution.Logical formLearned from3 sentences. An adverse impact can be on (air pollution).Logical formLearned from3 sentences. Chances can be constituted-of-or-filled-with pollution.Logical formLearned from3 sentences. (Pollution control) may undergo requirements.Logical formLearned from3 sentences. (Air pollution control) can be in a world-city.Logical formLearned from3 sentences. (Air pollution) may be recorded in a world-city.Logical formLearned from3 sentences. Vehicles can be a source of (air pollution).Logical formLearned from3 sentences. (Smoke pollution) may become a problem.Logical formLearned from3 sentences. (Water pollution) may pertain-to a river.Logical formLearned from3 sentences.