Discussion
A vehicle emits carbon monoxide at \( 1.8 \) g/km and travels \( 15000 \) km a year. Its annual emission is
Answer: C
Correct answer: 27.0 kg
Multiply the emission factor by the activity level, watching the units:
\[ 1.8\ \mathrm{g/km} \times 15\,000\ \mathrm{km} = 27\,000\ \mathrm{g} = 27.0\ \mathrm{kg\ per\ year} \]
This is the basic operation of an emission inventory - a factor relating emitted mass to an activity that is already recorded, in this case vehicle kilometres. No measurement of the individual vehicle is required, which is exactly why inventories can cover millions of sources.
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