A (pollution incident) may pertain-to a river.Logical formLearned from5 sentences. A (pollution density) may reach some mg/l.Logical formLearned from5 sentences. Pollution may affect an environment.Logical formLearned from5 sentences. A (pollution slick) can be in a river.Logical formLearned from5 sentences. A river may suffer (water pollution).Logical formLearned from5 sentences. A (water pollution situation) can be in a river.Logical formLearned from5 sentences. A (water pollution incident) may owe to an explosion of a (petrochemical plant).Logical formLearned from5 sentences. An (acid rain pollution) may pertain-to a country.Logical formLearned from5 sentences. An (air pollution) can be large-scale.Logical formLearned from5 sentences. (Pollution sources) can be serious.Logical formLearned from5 sentences. Pollution may be found.Logical formLearned from5 sentences. (Air pollution) can be in major cities.Logical formLearned from5 sentences. A plant may undergo pollution.Logical formLearned from5 sentences. An official can be in_charge_of (pollution control).Logical formLearned from5 sentences. A marine pollution can be serious.Logical formLearned from5 sentences.