Cooperation can be in (pollution control).Logical formLearned from4 sentences. Progress can be in (air pollution thanks).Logical formLearned from4 sentences. (Air pollution) may be caused by dust.Logical formLearned from4 sentences. Pollution may be caused by garbage.Logical formLearned from4 sentences. An (air pollution problem) may pertain-to a country.Logical formLearned from4 sentences. (Air pollution) can be in big cities.Logical formLearned from4 sentences. Pollution may pose a problem.Logical formLearned from4 sentences. A world-city may report (medium air pollution).Logical formLearned from4 sentences. A source can be constituted-of-or-filled-with urban (air pollution).Logical formLearned from4 sentences. Some sources can be constituted-of-or-filled-with (noise pollution).Logical formLearned from4 sentences. Pollution may undergo an accumulation.Logical formLearned from4 sentences. Regulations can be on (pollution control).Logical formLearned from4 sentences. Pollution can be in developing countries.Logical formLearned from4 sentences. Contributors can be to (water pollution).Logical formLearned from4 sentences. Some factories can be with (pollution problems).Logical formLearned from4 sentences.