Efforts may impose (pollution limits).Logical formLearned from4 sentences. Industries may pay for (pollution rights).Logical formLearned from4 sentences. (Pollution rights) can be free at present.Logical formLearned from4 sentences. Regulations may be aimed at reducing pollution.Logical formLearned from4 sentences. A blame can be for (air pollution).Logical formLearned from4 sentences. (Pollution concerns) may hang over a day of preparations.Logical formLearned from4 sentences. Pollution may worry athletes.Logical formLearned from4 sentences. (Pollution concerns) may hang_over a day of preparations.Logical formLearned from4 sentences. Some athletes may be complained about pollution.Logical formLearned from4 sentences. Fears can be over pollution.Logical formLearned from4 sentences. Worries can be about (pollution levels).Logical formLearned from4 sentences. A form can be constituted-of-or-filled-with industrial pollution.Logical formLearned from4 sentences. Pollution may represent a challenge.Logical formLearned from4 sentences. An (air pollution) may pertain-to a territory.Logical formLearned from4 sentences. Days can be with pollution.Logical formLearned from4 sentences.