Discussion
A relative risk of \( 1.06 \) per \( 10 \) micrograms per cubic metre of PM2.5 applies. An increase of \( 25 \) micrograms raises the risk by about
Answer: A
Correct answer: 15.4 per cent
The relative risk applies per 10 micrograms, so 25 micrograms is 2.5 such increments:
\[ RR = 1.06^{2.5} = 1.154 \]
an increase of about 15.4 per cent. The distractor \( 6.0 \) applies the risk once regardless of the increment, and \( 150 \) confuses the relative risk with a percentage. Note that the relation compounds rather than adding, though over this range the difference between compounding and simple multiplication is small.
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