A primary source can be constituted-of-or-filled-with pollution.Logical formLearned from8 sentences. A state can be constituted-of-or-filled-with pollution.Logical formLearned from8 sentences. (Air pollution problems) may pertain-to a country.Logical formLearned from8 sentences. An (air pollution) can be localized.Logical formLearned from8 sentences. A picture may show pollution.Logical formLearned from8 sentences. A fuel may produce (air pollution).Logical formLearned from8 sentences. (Acid rain) may be caused by (air pollution).Logical formLearned from8 sentences. (Air pollution) can be from cities.Logical formLearned from8 sentences. A (particle pollution) can be year-round.Logical formLearned from8 sentences. Pollution can be nasty.Logical formLearned from8 sentences. An (air pollution) can be localised.Logical formLearned from8 sentences. A (pollution problem) may pertain-to persons.Logical formLearned from8 sentences. An (air pollution problem) may pertain-to a US-city.Logical formLearned from8 sentences. (Air pollution) may undergo an abatement.Logical formLearned from8 sentences. Persons may be affected by pollution.Logical formLearned from8 sentences.