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Cold start emissions are disproportionately important because

  • A.Exhaust gas recirculation is at its maximum
  • B.The catalyst is below its light-off temperature and does almost nothing
  • C.The engine is running lean
  • D.The fuel is denser when cold

Answer: B

Until the bed reaches roughly three hundred degrees the conversion efficiency is very low, and a large share of a short trip's total emission occurs in those first minutes. Close-coupled converters and electrical heating both attack this directly.

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