(Pollution levels) can be global.Logical formLearned from6 sentences. An environment may be caused by pollution.Logical formLearned from6 sentences. A plant may produce pollution.Logical formLearned from6 sentences. Spikes can be in pollution.Logical formLearned from6 sentences. Pollution can be important.Logical formLearned from6 sentences. Forests may fare with levels of pollution.Logical formLearned from6 sentences. A (groundwater pollution problem) can be serious.Logical formLearned from6 sentences. A connection can be between pollution.Logical formLearned from6 sentences. (Pollution problems) can be urban.Logical formLearned from6 sentences. (Air pollution) can be in neighborhoods.Logical formLearned from6 sentences. Pollution may move.Logical formLearned from6 sentences. Habitat may undergo pollution.Logical formLearned from6 sentences. A source can be constituted-of-or-filled-with atmospheric pollution.Logical formLearned from6 sentences. Pollution may undergo a reduction.Logical formLearned from6 sentences. A focus can be on (air pollution).Logical formLearned from6 sentences.