Discussion
A pollutant formed in the atmosphere by reaction between other pollutants is called a _____ pollutant.
Answer: D
Correct answer: secondary
A secondary pollutant is one formed in the atmosphere by reaction between other substances rather than emitted from any source. Ozone is the classic example, formed from oxides of nitrogen and volatile organic compounds in sunlight; ammonium sulphate and nitrate aerosol and sulphuric acid in rain are others.
The distinction has a direct policy consequence: a secondary pollutant cannot be regulated by an emission limit on itself, because nothing emits it. Control must act on the precursors, and the chemistry between them is often non-linear.
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