(Air pollution) can be from stoves.Logical formLearned from4 sentences. A person may study pollution.Logical formLearned from4 sentences. A finger can be at pollution.Logical formLearned from4 sentences. Utilities may install (pollution controls).Logical formLearned from4 sentences. An international agreement can be on fighting (air pollution).Logical formLearned from4 sentences. (Pollution standards) may pertain-to persons.Logical formLearned from4 sentences. Economies can be with pollution.Logical formLearned from4 sentences. Pollution may present some risks.Logical formLearned from4 sentences. Pollution can be by (salt water) of supplies.Logical formLearned from4 sentences. Pollution can be at a rate.Logical formLearned from4 sentences. Smoke may add to (air pollution levels).Logical formLearned from4 sentences. Fuels may produce pollution.Logical formLearned from4 sentences. A cut can be in pollution.Logical formLearned from4 sentences. (Pollution laws) can be strict.Logical formLearned from4 sentences. Pollution may be caused by cars.Logical formLearned from4 sentences.