Air Polutions

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Across
  1. 2. opposite of "increase"
  2. 3. the ingredient of air
  3. 5. tiny dust in the air
  4. 6. bus, trains are kind of....
  5. 7. Place that produce pollutants,factory
Down
  1. 1. lung is ... system
  2. 4. Another name of smoke or smog- from burning