Pollution may affect persons.Logical formLearned from4 sentences. Pollution may kill some life.Logical formLearned from4 sentences. (Pollution problems) can be in rivers.Logical formLearned from4 sentences. A country may release (air pollution levels).Logical formLearned from4 sentences. Victims can be constituted-of-or-filled-with (air pollution).Logical formLearned from4 sentences. (Pollution risks) can be increased.Logical formLearned from4 sentences. A (pollution tax) can be controversial.Logical formLearned from4 sentences. A (pollution tax) can be on trucks.Logical formLearned from4 sentences. Environmental pollution can be in a nation.Logical formLearned from4 sentences. (Pollution levels) may soar to levels.Logical formLearned from4 sentences. A source can be constituted-of-or-filled-with (river pollution).Logical formLearned from4 sentences. (Air pollution) may soar.Logical formLearned from4 sentences. (Air pollution) may exceed limits.Logical formLearned from4 sentences. A level can be for declarring (pollution emergencies).Logical formLearned from4 sentences. A (trigger level) of some points of (ozone pollution) may lack a justification.Logical formLearned from4 sentences.