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Which non exhaust source has grown in relative importance?

  • A.Crankcase emissions
  • B.Particles from tyre, brake and road surface wear, which are now comparable with tailpipe particulates on many vehicles
  • C.Tyre and brake wear particles
  • D.Evaporative emissions, which have grown as fuel systems have become more complex on modern vehicles

Answer: C

As tailpipe particulates have fallen, wear particles have become the larger share. The last option states that comparison, which makes it a correct and more informative version of the same answer. The order in which the effects act is what decides the outcome, so it is worth establishing first. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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