(Air pollution) can be in an area.Logical formLearned from20 sentences. Pollution may be caused.Logical formLearned from20 sentences. Sources can be constituted-of-or-filled-with indoor (air pollution).Logical formLearned from20 sentences. Pollution may undergo a management.Logical formLearned from20 sentences. Pollution can be from farms.Logical formLearned from20 sentences. Action can be in response to (pollution issues).Logical formLearned from20 sentences. Workshop can be on (mercury pollution).Logical formLearned from20 sentences. A (mercury pollution) can be environmental.Logical formLearned from20 sentences. Pollution can be horrendous.Logical formLearned from20 sentences. Worries can be over pollution.Logical formLearned from20 sentences. Pollution can be in a lake.Logical formLearned from20 sentences. (Respiratory masks) may be concerned over reports of levels of (air pollution).Logical formLearned from20 sentences. Pollution may undergo concentration.Logical formLearned from20 sentences. Pollution can be from a mine.Logical formLearned from20 sentences. Pollution can be a problem.Logical formLearned from20 sentences.