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An operator proposes to double stack height rather than install control equipment.

How should a regulator respond?

  • A.Height dilutes but does not control
  • B.Approve it, since ground level concentrations will fall
  • C.Approve it, since the emission rate falls
  • D.Reject it as technically ineffective

Answer: A

The maximum ground level concentration would indeed fall roughly fourfold, but the same mass is still released and simply spread more widely. Regulators therefore credit height only up to the good engineering practice value.

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