The limit of $BOD$ prescribed by the Central Pollution Control Board $(CPCB)$ for the discharge of industrial and municipal wastewater into natural surface waters is

  • A
    $< 30 \ ppm$
  • B
    $< 3.0 \ ppm$
  • C
    $< 10 \ ppm$
  • D
    $< 100 \ ppm$

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