Discussion
Ambient PM2.5 is \( 68 \) micrograms per cubic metre against a guideline of \( 15 \). The exceedance factor is
Answer: A
Correct answer: 4.53
The exceedance factor is the measured concentration divided by the guideline:
\[ \frac{68}{15} = 4.53 \]
The distractor \( 0.22 \) inverts the ratio, and \( 53.0 \) is the arithmetic difference. Expressing the result as a multiple rather than a difference is standard practice because it is comparable across pollutants with quite different guideline values, and it conveys the scale of the problem more directly than an absolute excess.
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