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Which consequence followed from the tall stack policy?

  • A.Long range transport of acidifying pollutants
  • B.A complete elimination of the problem, since the pollutants were dispersed to concentrations below any concern
  • C.Increased local concentrations
  • D.A reduction in the total quantity of sulphur emitted, since the taller stacks allowed more efficient combustion

Answer: A

Raising the release height reduced local concentrations but allowed sulphur and nitrogen compounds to travel hundreds of kilometres before deposition, producing acid rain in Scandinavia from British and German sources. Emissions were unchanged in quantity. The episode is a standard illustration that dispersion is not the same as removal. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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