Across
- 2. A disease made worse by air pollution
- 3. Gas we need to breathe in
- 4. Coal oil and gas used for energy
- 7. A reddish-brown gas from vehicles
- 9. Gas with a strong smell that harms lungs
- 11. Organs that help you breathe
Down
- 1. A colourless, odourless gas that reduces oxygen in blood
- 5. Smoke mixed with fog
- 6. Tiny particles floating in the air
- 8. Harmful substances in the environment
- 10. Body system used for breathing