A reduction can be in (air pollution).Logical formLearned from35 sentences. A cause can be constituted-of-or-filled-with pollution.Logical formLearned from35 sentences. A world-city may undergo pollution.Logical formLearned from35 sentences. An (air pollution) may pertain-to a nation.Logical formLearned from35 sentences. (Pollution controls) can be state-of-the-art.Logical formLearned from35 sentences. Pollution may warm a planet.Logical formLearned from35 sentences. Some percent can be constituted-of-or-filled-with (air pollution).Logical formLearned from34 sentences. A percent may pertain-to an (air pollution).Logical formLearned from34 sentences. Stationary sources can be constituted-of-or-filled-with (air pollution).Logical formLearned from34 sentences. (Air pollution) can be in a city.Logical formLearned from34 sentences. Pollution can be in a region.Logical formLearned from34 sentences. Pollution can be related.Logical formLearned from34 sentences. Higher levels can be constituted-of-or-filled-with pollution.Logical formLearned from34 sentences. Pollution can be persistent.Logical formLearned from34 sentences. Problems can be with pollution.Logical formLearned from34 sentences.