| Irregular in their course, they are the filthiest we had anywhere seen. |
| Knowing this, the Aquasol Corporation has introduced a product to combat grime in the busiest shops and on the filthiest pipes. |
| They are fighting a lonely battle against a rich, corrupt and entrenched political class, braving occasional death threats to try to clean up one of the world's filthiest polities. |
| Sympathy is wasted on that Duke, who was one of the filthiest voluptuaries of his age, or of any other since that of Heliogabalus. |
| They are located in the filthiest sections of the city, and are never clean. |
| In fact, with pollution at nearly nine times the level deemed safe, Taiyuan probably had the filthiest air in the world. |
