Discussion
Which change would NOT reduce visibility impairment in a city?
Answer: D
Correct answer: Reducing carbon monoxide emissions
Carbon monoxide is colourless and does not interact appreciably with visible light, so reducing it would not improve visibility at all.
The other three would. Primary particulate scatters light directly; sulphur dioxide is the precursor of sulphate aerosol; and ammonia is the base that neutralises sulphuric and nitric acid to form ammonium sulphate and nitrate - both in the 0.1 to 1 micrometre range that scatters most efficiently. Ammonia is easy to overlook precisely because it is not itself a particle.
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