Across
- 3. The invisible gas we breathe
- 5. Dirty stuff that hurts the environment
- 6. Loud or annoying sound
- 9. Gray cloud from a fire
- 11. When cars are stuck and cannot move
Down
- 1. Garbage or things thrown away
- 2. Paintings or writing on public walls
- 4. Hard material for buildings and sidewalks
- 7. An empty area available to use
- 8. Cars moving on the road
- 10. Solid ground, not water