Unit 7 and 8

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Across
  1. 2. ozone, acid rain, NO2
  2. 5. accumulation of insecticide in Zooplankton
  3. 7. insecticide used in agriculture
  4. 8. a man spotted littering out his car window
  5. 9. carbon monoxide, nitrogen oxide, sulfur oxide
Down
  1. 1. spotting littered garbage on the street sidewalk
  2. 2. mix of fog and smoke
  3. 3. benzene, ethylene, glycol
  4. 4. industrial chemicals, pcb
  5. 6. certain plants, fungi, algae, etc.