Air pollution

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