Air pollution

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Across
  1. 4. Layer that protects Earth but harmful at ground level
  2. 6. Disease worsened by air pollution
  3. 7. Coal, oil, and gas causing pollution
  4. 8. Gas contributing to global warming
  5. 10. Harmful substance in the air
  6. 12. Common cause of urban air pollution
  7. 13. Visible pollution from burning materials
  8. 14. Major source of air pollution
Down
  1. 1. Tiny solid or liquid matter in air
  2. 2. Rain mixed with harmful chemicals
  3. 3. Cutting trees increases pollution
  4. 5. Harmful gas produced by engines
  5. 9. Gases released from vehicles and factories
  6. 11. Thick polluted air found in cities
  7. 15. Process affected by polluted air