| Subject | English | Italian |
| environ. | diffuse pollution source | fonte diffusa di inquinamento |
| environ. | diffuse pollution source | fonte diffusa d'inquinamento |
| environ. | diffuse source | fonte diffusa |
| environ. | diffuse source | sorgente diffusa |
| environ. | diffuse source Pollution which arises from various activities with no discrete source | sorgente diffusa |