Discussion
Statement I: Cold start emissions can be ignored on a long journey.
Statement II: The catalyst does almost nothing until it reaches its light-off temperature.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Statement I is incorrect but Statement II is correct
The second statement is true and it is exactly why the first fails. Until light-off the catalyst converts almost nothing, so the first minute or two passes essentially untreated exhaust.
That fixed quantity is emitted whatever the journey length, so it cannot be ignored - it simply becomes a smaller share of a longer trip while remaining the same absolute amount. Averaged over a fleet of short urban journeys it dominates, which is why cold start is a regulated test condition.
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