sootiness

例句：

1. 1. The old building had a lot of sootiness on its walls.
   这座旧建筑的墙上有很多污迹。
2. 2.The car was covered in sootiness from the factory.
   这辆车从工厂出来时沾满了污迹。
3. 3.The dirtiness of the road made it difficult for him to walk.
   路上的污迹让他很难走路。