Air pollution

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Across
  1. 3. Influx of acidic water that causes a rapid change in the water's pH
  2. 4. Short term effect of air pollution regarding the chest
  3. 10. Ultra rays of the sun cause emissions from cars, trucks + other sources reacting to oxygen
  4. 12. Put directly into the air by human activity.
  5. 13. harmful substance in the air to unhealthy levels
Down
  1. 1. primary pollutants react with other primary pollutants or naturally occurring substances
  2. 2. Several minerals that form in long thin fibers(Strength + resistance)
  3. 5. Air pollution that occurs indoors
  4. 6. Long term effect of air pollution regarding cancer.
  5. 7. When air pollution hangs over urban areas
  6. 8. Units the intensity, sound is measured in
  7. 9. The act passed in 1970 to regulate vehicle emission in the US
  8. 11. Precipitation that contains high concentration of acid