Across
- 1. Transport that can conserve human respiratory system
- 7. Carbon monoxide + Haemoglobin
- 8. Damage of the alveoli in the lungs
- 9. Respiratory disease that caused by haze, dust and pollen
- 10. Colourless gas with pungent smell
Down
- 2. One harmful substance that can cause lung cancer
- 3. Gas release by the combustion of fuel
- 4. Disease that occur in respiratory system
- 5. Toxic substances found in cigarrete
- 6. Green lungs