Discussion
The air quality index is best described as
Answer: B
Correct answer: One number covering several pollutants
The index computes a sub-index for each monitored pollutant against its own breakpoint scale, and reports one figure so that air quality can be communicated without the public interpreting several concentrations in different units.
It is a communication device rather than a measurement: the reported value is the worst sub-index, and the prominent pollutant is named alongside it. It is neither a sum nor a ratio of emission to concentration, both of which would obscure what it exists to convey.
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