Discussion
Which statement about acid deposition is TRUE?
Answer: C
Correct answer: It occurs hundreds of kilometres away
Acid deposition is a long-range phenomenon. Sulphur dioxide and nitrogen oxides must first be oxidised to sulphuric and nitric acid, which takes hours to days, and the air mass travels throughout - so deposition typically occurs hundreds or even thousands of kilometres downwind of the source.
That displacement is what makes it a transboundary political problem rather than a local one, and it was the basis of the international conventions negotiated to address it. It is a tropospheric process, not a stratospheric one, and carbon monoxide plays no part.
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