Discussion
Cold start accounts for \( 60 \) per cent of a trip's hydrocarbon emission over the first \( 2 \) km of a \( 10 \) km journey. Over the remaining \( 8 \) km the vehicle emits
Answer: D
Correct answer: 40 per cent of the total
The remainder is simply what the first 2 km does not account for:
\[ 100 - 60 = 40\% \]
So a fifth of the distance produces three fifths of the hydrocarbons. The reason is the cold catalyst, which converts almost nothing until light-off, together with the rich mixture the engine needs to run smoothly when cold. It is why a short journey emits far more per kilometre than a long one.
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