A

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Q. What is the level of Hydrocarbons occurring in the urban environment ?

  • (A) 1 to 4 pmm
  • (B) 20 - 100 pmm
  • (C) 14 - 20 pmm
  • (D) above 10 ppm
  • Correct Answer - Option(A)
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  • Filed under category Geography
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