Air quality

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