Discussion
A city of \( 800000 \) vehicles each emitting \( 27 \) kg of carbon monoxide a year emits in total
Answer: D
Correct answer: 21600 tonnes
Scale the per-vehicle emission to the fleet:
\[ 800\,000 \times 27\ \mathrm{kg} = 21\,600\,000\ \mathrm{kg} = 21\,600\ \mathrm{tonnes\ per\ year} \]
The step from one vehicle to a city is what makes an area or line source treatment necessary: no inventory tracks 800,000 vehicles individually, so the fleet is represented by activity data and a factor. The arithmetic also shows why a small reduction in the per-vehicle factor is worth a great deal in aggregate.
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