A (pollution standard) can be for (soot particles).Logical formLearned from13 sentences. (Air pollution) can be from coal-fired (power plants).Logical formLearned from13 sentences. A (carbon pollution) may pertain-to persons.Logical formLearned from13 sentences. (Pollution levels) may drop.Logical formLearned from13 sentences. Pollution may drop.Logical formLearned from13 sentences. Pollution can be in a watershed.Logical formLearned from13 sentences. (Pollution drops) may pertain-to a country.Logical formLearned from13 sentences. Requirements can be for (pollution controls).Logical formLearned from13 sentences. (Air pollution problems) can be indoor.Logical formLearned from13 sentences. A sensitivity can be to pollution.Logical formLearned from13 sentences. (Pollution credits) may undergo a trading.Logical formLearned from13 sentences. A level can be constituted-of-or-filled-with (air pollution).Logical formLearned from13 sentences. Pollution may undergo an increase.Logical formLearned from13 sentences. Pollution may know boundaries.Logical formLearned from13 sentences. A (lead pollution) can be airborne.Logical formLearned from13 sentences.