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Assertion (A): Regulators limit the dispersion credit given for stack height.

Reason (R): A tall stack releases the same mass of pollutant, merely where it is diluted more.

Select the correct answer from the options below.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Correct answer: Both A and R are true, and R is the correct explanation of A

The reason is the whole basis of the limit. Because a tall stack releases the same mass and merely disperses it more widely, allowing unlimited credit for height would let dispersion substitute for control - solving a local problem by making a regional one.

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