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Which statement about tall stacks is FALSE?

  • A.They move the maximum further downwind
  • B.Regulators limit the credit given for height
  • C.They reduce the mass of pollutant emitted
  • D.They reduce the maximum ground level concentration

Answer: C

Correct answer: They reduce the mass of pollutant emitted

That is the false statement. A tall stack changes where the pollutant arrives, not how much leaves. The other three are true: it lowers the maximum ground-level concentration, moves that maximum further downwind, and is for exactly this reason given only limited credit by regulators.

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