(Air pollution) can be a problem.Logical formLearned from133 sentences. Air may undergo pollution.Logical formLearned from132 sentences. Pollution can be from sources.Logical formLearned from128 sentences. Some sources can be constituted-of-or-filled-with pollution.Logical formLearned from123 sentences. Reductions can be in pollution.Logical formLearned from121 sentences. Pollution can be white.Logical formLearned from119 sentences. A percent may pertain-to pollution.Logical formLearned from114 sentences. A land may be destroyed by (oil industry pollution).Logical formLearned from108 sentences. Pollution can be in a country.Logical formLearned from107 sentences. Concerns can be about pollution.Logical formLearned from107 sentences. An (air pollution) may pertain-to a city.Logical formLearned from106 sentences. Pollution can be biological.Logical formLearned from105 sentences. Pollution can be diffuse.Logical formLearned from102 sentences. A reduction can be in pollution.Logical formLearned from102 sentences. Pollution can be from (power plants).Logical formLearned from102 sentences.