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6. What is the pH for rainwater?

  • pH 5.6
  • pH 5.5
  • pH 5
  • pH 6

7. What year was the Great Smog?

  • 1953
  • 1950
  • 1952
  • 1951

8. How many days did the Great Smog last?

  • 30
  • 5
  • 10
  • 1