Urban Problems

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