pollutant dispersion

例句：

1. 1.The pollutant dispersion in the city has been a major concern for environmentalists.
   城市中的污染物扩散一直是环保人士的重大问题。
2. 2. The government has implemented strict measures to control the dispersion of pollutants in the air.
   政府已经实施了严格的措施来控制空气中污染物的扩散。
3. 3.The scientists studied the dispersion of pollutants in the ocean and found that it was affecting marine life.
   科学家们研究了海洋中污染物的扩散情况，并发现它正在影响海洋生物。