pollution from land-based source

例句：

1. 1. The factory's emissions are amajor source of pollution in the area.
   工厂的排放是该地区的主要污染源。
2. 2. Thegovernment has been working to reduce air pollutionin the city.
   政府一直在努力减少城市的空气污染。
3. 3. The pollution from the river is affectingthe health of the local population.
   河流的污染影响了当地居民的健康。