Across
- 2. this can be affected by pollution
- 3. a disease caused by the poor quality of the air
- 9. name of a gas
- 11. gases produced by cars or factories
Down
- 1. rubbish,trash
- 2. of air
- 4. rain that is "poisonous" because of the poor
- 5. the amount of water vapor in the air
- 6. a thin part of the Earth's atmosphere
- 7. smoke or gas that is gangerous to smell
- 8. breathe
- 10. a mixture of smoke and fog especially in cities