A comparative advantage can be in pollution.Logical formLearned from3 sentences. Plants may emit pollution.Logical formLearned from3 sentences. Plants may generate pollution.Logical formLearned from3 sentences. (Air pollution) may exacerbate asthma.Logical formLearned from3 sentences. Work can be on issues of (mercury pollution).Logical formLearned from3 sentences. Respect can be to a prevention of pollution.Logical formLearned from3 sentences. An (air pollution) can be unhealthful.Logical formLearned from3 sentences. An (air pollution prevention) can be regional.Logical formLearned from3 sentences. A source can be constituted-of-or-filled-with visual pollution.Logical formLearned from3 sentences. Some aspect can be constituted-of-or-filled-with (air pollution).Logical formLearned from3 sentences. Information can be on smogs of (air pollution).Logical formLearned from3 sentences. Smogs can be constituted-of-or-filled-with (air pollution).Logical formLearned from3 sentences. (Air pollution) may affect health a deal.Logical formLearned from3 sentences. (Health problems) can be due to (air pollution).Logical formLearned from3 sentences. Cars can be a source of (air pollution).Logical formLearned from3 sentences.